diff --git a/src/common/display.c b/src/common/display.c
index 73177bf748..c9d6720812 100644
--- a/src/common/display.c
+++ b/src/common/display.c
@@ -28,6 +28,8 @@
 #include <stdlib.h>
 #include <string.h>
 
+#include <stdio.h>
+
 /**
  * Synchronizes all surfaces within the given linked list to the given socket.
  * If the provided pointer to the linked list is NULL, this function has no
@@ -167,23 +169,39 @@ void guac_common_display_dup(
         guac_common_display* display, guac_client* client,
         guac_socket* socket) {
 
+    fprintf(stderr, "guac_common_display_dup start\n");
+
     pthread_mutex_lock(&display->_lock);
 
+    fprintf(stderr, "pthread_mutex_lock(&display->_lock); done\n");
+
     /* Sunchronize shared cursor */
     guac_common_cursor_dup(display->cursor, client, socket);
 
+    fprintf(stderr, "guac_common_cursor_dup(display->cursor, client, socket); done\n");
+
     /* Synchronize default surface */
     guac_common_surface_dup(display->default_surface, client, socket);
 
+    fprintf(stderr, "guac_common_surface_dup(display->default_surface, client, socket); done\n");
+
     /* Synchronize all layers and buffers */
     guac_common_display_dup_layers(display->layers, client, socket);
+
+    fprintf(stderr, "guac_common_display_dup_layers(display->layers, client, socket); done\n");
     guac_common_display_dup_layers(display->buffers, client, socket);
 
+    fprintf(stderr, "guac_common_display_dup_layers(display->buffers, client, socket); done\n");
+
     /* Sends a sync instruction to mark the boundary of the first frame */
     guac_protocol_send_sync(socket, client->last_sent_timestamp, 1);
 
+    fprintf(stderr, "guac_protocol_send_sync(socket, client->last_sent_timestamp, 1); done\n");
+
     pthread_mutex_unlock(&display->_lock);
 
+    fprintf(stderr, "guac_common_display_dup end\n");
+
 }
 
 void guac_common_display_set_lossless(guac_common_display* display,
diff --git a/src/libguac/client.c b/src/libguac/client.c
index b904fb7e42..788a8169ef 100644
--- a/src/libguac/client.c
+++ b/src/libguac/client.c
@@ -252,6 +252,8 @@ static void guac_client_promote_pending_users(union sigval data) {
 
 guac_client* guac_client_alloc() {
 
+    fprintf(stderr, "guac_client_alloc start\n");
+
     int i;
 
     /* Allocate new client */
@@ -308,12 +310,16 @@ guac_client* guac_client_alloc() {
     client->socket = guac_socket_broadcast(client);
     client->pending_socket = guac_socket_broadcast_pending(client);
 
+    fprintf(stderr, "guac_client_alloc end\n");
+
     return client;
 
 }
 
 void guac_client_free(guac_client* client) {
 
+    fprintf(stderr, "guac_client_free start\n");
+
     /* Acquire write locks before referencing user pointers */
     guac_rwlock_acquire_write_lock(&(client->__pending_users_lock));
     guac_rwlock_acquire_write_lock(&(client->__users_lock));
@@ -376,6 +382,8 @@ void guac_client_free(guac_client* client) {
 
     free(client->connection_id);
     free(client);
+
+    fprintf(stderr, "guac_client_free end\n");
 }
 
 void vguac_client_log(guac_client* client, guac_client_log_level level,
@@ -450,6 +458,8 @@ void guac_client_abort(guac_client* client, guac_protocol_status status,
 static void guac_client_add_pending_user(
         guac_client* client, guac_user* user) {
 
+    fprintf(stderr, "guac_client_add_pending_user start\n");
+
     /* Acquire the lock for modifying the list of pending users */
     guac_rwlock_acquire_write_lock(&(client->__pending_users_lock));
 
@@ -467,6 +477,8 @@ static void guac_client_add_pending_user(
     /* Release the lock */
     guac_rwlock_release_lock(&(client->__pending_users_lock));
 
+    fprintf(stderr, "guac_client_add_pending_user end\n");
+
 }
 
 /**
@@ -484,6 +496,8 @@ static void guac_client_add_pending_user(
  */
 static int guac_client_start_pending_users_timer(guac_client* client) {
 
+    fprintf(stderr, "guac_client_start_pending_users_timer start\n");
+
     pthread_mutex_lock(&(client->__pending_users_timer_mutex));
 
     /* Return success if the timer is already created and running */
@@ -526,12 +540,17 @@ static int guac_client_start_pending_users_timer(guac_client* client) {
     client->__pending_users_timer_state = GUAC_CLIENT_PENDING_TIMER_REGISTERED;
 
     pthread_mutex_unlock(&(client->__pending_users_timer_mutex));
+
+    fprintf(stderr, "guac_client_start_pending_users_timer end\n");
+
     return 0;
 
 }
 
 int guac_client_add_user(guac_client* client, guac_user* user, int argc, char** argv) {
 
+    fprintf(stderr, "guac_client_add_user start\n");
+
     /* Create and start the timer if it hasn't already been initialized */
     if (guac_client_start_pending_users_timer(client)) {
 
@@ -569,12 +588,16 @@ int guac_client_add_user(guac_client* client, guac_user* user, int argc, char**
     if (retval == 0 && !user->owner)
         guac_client_owner_notify_join(client, user);
 
+    fprintf(stderr, "guac_client_add_user end\n");
+
     return retval;
 
 }
 
 void guac_client_remove_user(guac_client* client, guac_user* user) {
 
+    fprintf(stderr, "guac_client_remove_user start\n");
+
     guac_rwlock_acquire_write_lock(&(client->__pending_users_lock));
     guac_rwlock_acquire_write_lock(&(client->__users_lock));
 
@@ -609,10 +632,14 @@ void guac_client_remove_user(guac_client* client, guac_user* user) {
     else if (client->leave_handler)
         client->leave_handler(user);
 
+    fprintf(stderr, "guac_client_remove_user end\n");
+
 }
 
 void guac_client_foreach_user(guac_client* client, guac_user_callback* callback, void* data) {
 
+    fprintf(stderr, "guac_client_foreach_user start\n");
+
     guac_user* current;
 
     guac_rwlock_acquire_read_lock(&(client->__users_lock));
@@ -626,11 +653,15 @@ void guac_client_foreach_user(guac_client* client, guac_user_callback* callback,
 
     guac_rwlock_release_lock(&(client->__users_lock));
 
+    fprintf(stderr, "guac_client_foreach_user end\n");
+
 }
 
 void guac_client_foreach_pending_user(
         guac_client* client, guac_user_callback* callback, void* data) {
 
+    fprintf(stderr, "guac_client_foreach_pending_user start\n");
+
     guac_user* current;
 
     guac_rwlock_acquire_read_lock(&(client->__pending_users_lock));
@@ -644,11 +675,15 @@ void guac_client_foreach_pending_user(
 
     guac_rwlock_release_lock(&(client->__pending_users_lock));
 
+    fprintf(stderr, "guac_client_foreach_pending_user end\n");
+
 }
 
 void* guac_client_for_owner(guac_client* client, guac_user_callback* callback,
         void* data) {
 
+    fprintf(stderr, "guac_client_for_owner start\n");
+
     void* retval;
 
     guac_rwlock_acquire_read_lock(&(client->__users_lock));
@@ -658,6 +693,8 @@ void* guac_client_for_owner(guac_client* client, guac_user_callback* callback,
 
     guac_rwlock_release_lock(&(client->__users_lock));
 
+    fprintf(stderr, "guac_client_for_owner end\n");
+
     /* Return value from callback */
     return retval;
 
@@ -666,6 +703,8 @@ void* guac_client_for_owner(guac_client* client, guac_user_callback* callback,
 void* guac_client_for_user(guac_client* client, guac_user* user,
         guac_user_callback* callback, void* data) {
 
+    fprintf(stderr, "guac_client_for_user start\n");
+
     guac_user* current;
 
     int user_valid = 0;
@@ -695,6 +734,8 @@ void* guac_client_for_user(guac_client* client, guac_user* user,
 
     guac_rwlock_release_lock(&(client->__users_lock));
 
+    fprintf(stderr, "guac_client_for_user end\n");
+
     /* Return value from callback */
     return retval;
 
@@ -706,6 +747,8 @@ int guac_client_end_frame(guac_client* client) {
 
 int guac_client_end_multiple_frames(guac_client* client, int frames) {
 
+    fprintf(stderr, "guac_client_end_multiple_frames start\n");
+
     /* Update and send timestamp */
     client->last_sent_timestamp = guac_timestamp_current();
 
@@ -713,12 +756,16 @@ int guac_client_end_multiple_frames(guac_client* client, int frames) {
     guac_client_log(client, GUAC_LOG_TRACE, "Server completed "
             "frame %" PRIu64 "ms (%i logical frames)", client->last_sent_timestamp, frames);
 
+    fprintf(stderr, "guac_client_end_multiple_frames end\n");
+
     return guac_protocol_send_sync(client->socket, client->last_sent_timestamp, frames);
 
 }
 
 int guac_client_load_plugin(guac_client* client, const char* protocol) {
 
+    fprintf(stderr, "guac_client_load_plugin start\n");
+
     /* Reference to dlopen()'d plugin */
     void* client_plugin_handle;
 
@@ -766,6 +813,8 @@ int guac_client_load_plugin(guac_client* client, const char* protocol) {
     /* Init client */
     client->__plugin_handle = client_plugin_handle;
 
+    fprintf(stderr, "guac_client_load_plugin end\n");
+
     return alias.client_init(client);
 
 }
@@ -1043,6 +1092,8 @@ int guac_client_owner_supports_required(guac_client* client) {
  */
 static void* guac_client_owner_notify_join_callback(guac_user* user, void* data) {
 
+    fprintf(stderr, "guac_client_owner_notify_join_callback start\n");
+
     const guac_user* joiner = (const guac_user *) data;
 
     if (user == NULL)
@@ -1064,6 +1115,8 @@ static void* guac_client_owner_notify_join_callback(guac_user* user, void* data)
     
     /* Send user joined notification to owner. */
     const char* args[] = { (const char*)joiner->user_id, (const char*)send_joiner, NULL };
+
+    fprintf(stderr, "guac_client_owner_notify_join_callback end\n");
     return (void*) ((intptr_t) guac_protocol_send_msg(user->socket, GUAC_MESSAGE_USER_JOINED, args));
 
 }
@@ -1102,6 +1155,8 @@ int guac_client_owner_notify_join(guac_client* client, guac_user* joiner) {
  */
 static void* guac_client_owner_notify_leave_callback(guac_user* user, void* data) {
 
+    fprintf(stderr, "guac_client_owner_notify_leave_callback start\n");
+
     const guac_user* quitter = (const guac_user *) data;
 
     if (user == NULL)
diff --git a/src/protocols/vnc/client.c b/src/protocols/vnc/client.c
index ea7d44b3cb..341c7ad44f 100644
--- a/src/protocols/vnc/client.c
+++ b/src/protocols/vnc/client.c
@@ -55,10 +55,14 @@
  */
 static void* guac_vnc_sync_pending_user_audio(guac_user* user, void* data) {
 
+    fprintf(stderr, "guac_vnc_sync_pending_user_audio start\n");
+
     /* Add the user to the stream */
     guac_pa_stream* audio = (guac_pa_stream*) data;
     guac_pa_stream_add_user(audio, user);
 
+    fprintf(stderr, "guac_vnc_sync_pending_user_audio end\n");
+
     return NULL;
 
 }
@@ -76,10 +80,14 @@ static void* guac_vnc_sync_pending_user_audio(guac_user* user, void* data) {
  */
 static int guac_vnc_join_pending_handler(guac_client* client) {
 
+    fprintf(stderr, "guac_vnc_join_pending_handler start\n");
+
     guac_vnc_client* vnc_client = (guac_vnc_client*) client->data;
     guac_socket* broadcast_socket = client->pending_socket;
 
 #ifdef ENABLE_PULSE
+
+    fprintf(stderr, "calling guac_vnc_sync_pending_user_audio()\n");
     /* Synchronize any audio stream for each pending user */
     if (vnc_client->audio)
         guac_client_foreach_pending_user(
@@ -92,12 +100,16 @@ static int guac_vnc_join_pending_handler(guac_client* client) {
         guac_socket_flush(broadcast_socket);
     }
 
+    fprintf(stderr, "guac_vnc_join_pending_handler end\n");
+
     return 0;
 
 }
 
 int guac_client_init(guac_client* client) {
 
+    fprintf(stderr, "guac_client_init (VNC) start\n");
+
     /* Set client args */
     client->args = GUAC_VNC_CLIENT_ARGS;
 
@@ -119,11 +131,15 @@ int guac_client_init(guac_client* client) {
     client->leave_handler = guac_vnc_user_leave_handler;
     client->free_handler = guac_vnc_client_free_handler;
 
+    fprintf(stderr, "guac_client_init (VNC) end\n");
+
     return 0;
 }
 
 int guac_vnc_client_free_handler(guac_client* client) {
 
+    fprintf(stderr, "guac_vnc_client_free_handler start\n");
+
     guac_vnc_client* vnc_client = (guac_vnc_client*) client->data;
     guac_vnc_settings* settings = vnc_client->settings;
 
@@ -211,6 +227,8 @@ int guac_vnc_client_free_handler(guac_client* client) {
     /* Free generic data struct */
     free(client->data);
 
+    fprintf(stderr, "guac_vnc_client_free_handler (VNC) end\n");
+
     return 0;
 }
 
diff --git a/src/protocols/vnc/vnc.c b/src/protocols/vnc/vnc.c
index 3b94d5e759..827aafeb9e 100644
--- a/src/protocols/vnc/vnc.c
+++ b/src/protocols/vnc/vnc.c
@@ -268,6 +268,8 @@ static int guac_vnc_wait_for_messages(rfbClient* rfb_client, int timeout) {
 
 void* guac_vnc_client_thread(void* data) {
 
+    fprintf(stderr, "guac_vnc_client_thread start\n");
+
     guac_client* client = (guac_client*) data;
     guac_vnc_client* vnc_client = (guac_vnc_client*) client->data;
     guac_vnc_settings* settings = vnc_client->settings;
@@ -286,6 +288,8 @@ void* guac_vnc_client_thread(void* data) {
         if (settings->wol_wait_time > 0)
             guac_timestamp_msleep(settings->wol_wait_time * 1000);
     }
+
+    fprintf(stderr, "guac_vnc_client_thread done with wol stuff\n");
     
     /* Configure clipboard encoding */
     if (guac_vnc_set_clipboard_encoding(client, settings->clipboard_encoding)) {
@@ -293,6 +297,8 @@ void* guac_vnc_client_thread(void* data) {
                 "clipboard encoding: '%s'.", settings->clipboard_encoding);
     }
 
+    fprintf(stderr, "guac_vnc_client_thread done with guac_vnc_set_clipboard_encoding\n");
+
     /* Set up libvncclient logging */
     rfbClientLog = guac_vnc_client_log_info;
     rfbClientErr = guac_vnc_client_log_error;
@@ -301,6 +307,8 @@ void* guac_vnc_client_thread(void* data) {
     rfbClient* rfb_client = guac_vnc_get_client(client);
     int retries_remaining = settings->retries;
 
+    fprintf(stderr, "guac_vnc_client_thread done with guac_vnc_get_client\n");
+
     /* If unsuccessful, retry as many times as specified */
     while (!rfb_client && retries_remaining > 0) {
 
@@ -322,6 +330,8 @@ void* guac_vnc_client_thread(void* data) {
         return NULL;
     }
 
+    fprintf(stderr, "guac_vnc_client_thread deffo connected\n");
+
 #ifdef ENABLE_PULSE
     /* If audio is enabled, start streaming via PulseAudio */
     if (settings->audio_enabled)
@@ -332,9 +342,13 @@ void* guac_vnc_client_thread(void* data) {
 #ifdef ENABLE_COMMON_SSH
     guac_common_ssh_init(client);
 
+    fprintf(stderr, "guac_vnc_client_thread done with guac_common_ssh_init\n");
+
     /* Connect via SSH if SFTP is enabled */
     if (settings->enable_sftp) {
 
+        fprintf(stderr, "guac_vnc_client_thread doing sftp stuff\n");
+
         /* Abort if username is missing */
         if (settings->sftp_username == NULL) {
             guac_client_abort(client, GUAC_PROTOCOL_STATUS_SERVER_ERROR,
@@ -416,6 +430,10 @@ void* guac_vnc_client_thread(void* data) {
     }
 #endif
 
+
+
+    fprintf(stderr, "guac_vnc_client_thread done with sftp stuff\n");
+
     /* Set remaining client data */
     vnc_client->rfb_client = rfb_client;
 
@@ -431,14 +449,20 @@ void* guac_vnc_client_thread(void* data) {
                 settings->recording_include_keys);
     }
 
+    fprintf(stderr, "guac_vnc_client_thread done with guac_recording_create\n");
+
     /* Create display */
     vnc_client->display = guac_common_display_alloc(client,
             rfb_client->width, rfb_client->height);
 
+    fprintf(stderr, "guac_vnc_client_thread done with guac_common_display_alloc\n");
+
     /* Use lossless compression only if requested (otherwise, use default
      * heuristics) */
     guac_common_display_set_lossless(vnc_client->display, settings->lossless);
 
+    fprintf(stderr, "guac_vnc_client_thread done with guac_common_display_set_lossless\n");
+
     /* If not read-only, set an appropriate cursor */
     if (settings->read_only == 0) {
         if (settings->remote_cursor)
@@ -448,16 +472,25 @@ void* guac_vnc_client_thread(void* data) {
 
     }
 
+    fprintf(stderr, "guac_vnc_client_thread done with cursor stuff\n");
+
     guac_socket_flush(client->socket);
 
+    fprintf(stderr, "guac_vnc_client_thread done with guac_socket_flush(client->socket);\n");
+
     guac_timestamp last_frame_end = guac_timestamp_current();
 
+    fprintf(stderr, "guac_vnc_client_thread done current timestamp: %li\n", last_frame_end);
+
     /* Handle messages from VNC server while client is running */
     while (client->state == GUAC_CLIENT_RUNNING) {
 
         /* Wait for start of frame */
         int wait_result = guac_vnc_wait_for_messages(rfb_client,
                 GUAC_VNC_FRAME_START_TIMEOUT);
+
+        fprintf(stderr, "got wait result: %i\n", wait_result);
+
         if (wait_result > 0) {
 
             int processing_lag = guac_client_get_processing_lag(client);
@@ -512,16 +545,22 @@ void* guac_vnc_client_thread(void* data) {
         if (wait_result < 0)
             guac_client_abort(client, GUAC_PROTOCOL_STATUS_UPSTREAM_ERROR, "Connection closed.");
 
+        fprintf(stderr, "guac_vnc_client_thread about to flush frame\n");
+
         /* Flush frame */
         guac_common_surface_flush(vnc_client->display->default_surface);
         guac_client_end_frame(client);
         guac_socket_flush(client->socket);
 
+        fprintf(stderr, "guac_vnc_client_thread about flushed frame\n");
+
     }
 
     /* Kill client and finish connection */
     guac_client_stop(client);
     guac_client_log(client, GUAC_LOG_INFO, "Internal VNC client disconnected");
+
+    fprintf(stderr, "guac_vnc_client_thread end\n");
     return NULL;
 
 }