diff --git a/js/forms.js b/js/forms.js
index 13234b3ca..464960958 100644
--- a/js/forms.js
+++ b/js/forms.js
@@ -65,7 +65,7 @@ Liberapay.forms.jsSubmit = function() {
         // Determine the submission mode
         var form_on_success = form.getAttribute('data-on-success');
         var button, button_on_success;
-        if (e.submitter.tagName == 'BUTTON') {
+        if (e.submitter && e.submitter.tagName == 'BUTTON') {
             button = e.submitter;
             button_on_success = button.getAttribute('data-on-success');
         }
diff --git a/liberapay/elsewhere/twitter.py b/liberapay/elsewhere/twitter.py
index f5c93cc41..bd51bc050 100644
--- a/liberapay/elsewhere/twitter.py
+++ b/liberapay/elsewhere/twitter.py
@@ -8,7 +8,7 @@ class Twitter(PlatformOAuth1):
     # Platform attributes
     name = 'twitter'
     display_name = 'Twitter'
-    account_url = 'https://twitter.com/{user_name}'
+    account_url = 'https://x.com/{user_name}'
 
     # Auth attributes
     auth_url = 'https://api.twitter.com'
diff --git a/www/%username/giving/pay/paypal/%payin_id.spt b/www/%username/giving/pay/paypal/%payin_id.spt
index c2d96b40b..5ecd6384c 100644
--- a/www/%username/giving/pay/paypal/%payin_id.spt
+++ b/www/%username/giving/pay/paypal/%payin_id.spt
@@ -40,6 +40,7 @@ if request.method == 'POST':
           JOIN participants p ON p.id = t.tippee
          WHERE t.tipper = %s
            AND t.id IN %s
+           AND t.renewal_mode > 0
            AND p.payment_providers & %s > 0
       ORDER BY t.id
     """, (payer.id, set(body.parse_list('tips', int)), PAYPAL_BIT))
@@ -106,7 +107,7 @@ tippees = request.qs.parse_list('beneficiary', int, default=None)
 if tippees:
     tips = [
         tip for tip in payer.get_tips_to(tippees)
-        if tip.tippee_p.payment_providers & PAYPAL_BIT > 0
+        if tip.renewal_mode > 0 and tip.tippee_p.payment_providers & PAYPAL_BIT > 0
     ]
     if len(set(tip.amount.currency for tip in tips)) != 1:
         raise response.invalid_input(tippees, 'beneficiary', 'querystring')
diff --git a/www/%username/giving/pay/stripe/%payin_id.spt b/www/%username/giving/pay/stripe/%payin_id.spt
index 9ed8d036c..a24f700c7 100644
--- a/www/%username/giving/pay/stripe/%payin_id.spt
+++ b/www/%username/giving/pay/stripe/%payin_id.spt
@@ -50,6 +50,7 @@ if request.method == 'POST':
           JOIN participants p ON p.id = t.tippee
          WHERE t.tipper = %s
            AND t.id IN %s
+           AND t.renewal_mode > 0
            AND p.payment_providers & %s > 0
       ORDER BY t.id
     """, (payer.id, set(body.parse_list('tips', int)), STRIPE_BIT))
@@ -198,7 +199,7 @@ tippees = request.qs.parse_list('beneficiary', int, default=None)
 if tippees:
     tips = [
         tip for tip in payer.get_tips_to(tippees)
-        if tip.tippee_p.payment_providers & STRIPE_BIT > 0
+        if tip.renewal_mode > 0 and tip.tippee_p.payment_providers & STRIPE_BIT > 0
     ]
     if len(set(tip.amount.currency for tip in tips)) != 1:
         raise response.invalid_input(tippees, 'beneficiary', 'querystring')
diff --git a/www/%username/routes/index.spt b/www/%username/routes/index.spt
index 606f9cb7c..57588494b 100644
--- a/www/%username/routes/index.spt
+++ b/www/%username/routes/index.spt
@@ -191,9 +191,9 @@ title = _("Payment Instruments")
                         name="set_as_default_for" value="{{ route.id }}:"
                         title="{{ _(
                             'Stop using this instrument by default for payments in {currency}.',
-                            currency=Currency(last_payin.amount.currency)
+                            currency=Currency(route.is_default_for)
                         ) }}">{{ _(
-                    "Unset as default for {currency}", currency=last_payin.amount.currency
+                    "Unset as default for {currency}", currency=route.is_default_for
                 ) }}</button>
             % elif route.network != 'stripe-card' and last_payin and participant.donates_in_multiple_currencies
                 <button class="btn btn-primary btn-xs"