diff --git a/devito/ir/iet/nodes.py b/devito/ir/iet/nodes.py
index 9def607678..378d0be721 100644
--- a/devito/ir/iet/nodes.py
+++ b/devito/ir/iet/nodes.py
@@ -1460,7 +1460,6 @@ def __repr__(self):
         fstrings = []
         for f in self.functions:
             loc_indices = set().union(*[self.halo_scheme.fmapper[f].loc_indices.values()])
-            loc_indices = list(loc_indices)
             loc_indices_str = str(list(loc_indices)) if loc_indices else ""
 
             fstrings.append(f"{f.name}{loc_indices_str}")
diff --git a/devito/passes/iet/mpi.py b/devito/passes/iet/mpi.py
index ccc3dc729f..2aff3fd5c9 100644
--- a/devito/passes/iet/mpi.py
+++ b/devito/passes/iet/mpi.py
@@ -137,10 +137,15 @@ def _process_halo_to_halo(hs0, hs1, iters, scopes, hsmapper, imapper):
                 # the loc_indices with known values
                 # TODO: Can I get this in a more elegant way?
                 for d in hse.loc_indices:
-                    root_min = hse.loc_indices[d].symbolic_min
-                    new_min = root_min.subs(hse.loc_indices[d].root,
-                                            hse.loc_indices[d].root.symbolic_min)
-                    raw_loc_indices[d] = new_min
+                    if hse.loc_indices[d].is_Symbol:
+                        assert d in hse.loc_indices[d]._defines
+                        root_min = hse.loc_indices[d].symbolic_min
+                        new_min = root_min.subs(hse.loc_indices[d].root,
+                                                hse.loc_indices[d].root.symbolic_min)
+                        raw_loc_indices[d] = new_min
+                    else:
+                        assert d.symbolic_min in hse.loc_indices[d].free_symbols
+                        raw_loc_indices[d] = hse.loc_indices[d]
 
                 hse = hse.rebuild(loc_indices=frozendict(raw_loc_indices))
                 hs1.halo_scheme.fmapper[f] = hse
diff --git a/examples/mpi/overview.ipynb b/examples/mpi/overview.ipynb
index bf48338218..c76dd81cc8 100644
--- a/examples/mpi/overview.ipynb
+++ b/examples/mpi/overview.ipynb
@@ -248,17 +248,7 @@
      "output_type": "stream",
      "text": [
       "[stderr:0] \n",
-      "Operator `Kernel` ran in 0.01 s\n",
-      "INFO:Devito:Operator `Kernel` ran in 0.01 s\n",
-      "[stderr:1] \n",
-      "Operator `Kernel` ran in 0.01 s\n",
-      "INFO:Devito:Operator `Kernel` ran in 0.01 s\n",
-      "[stderr:2] \n",
-      "Operator `Kernel` ran in 0.01 s\n",
-      "INFO:Devito:Operator `Kernel` ran in 0.01 s\n",
-      "[stderr:3] \n",
-      "Operator `Kernel` ran in 0.01 s\n",
-      "INFO:Devito:Operator `Kernel` ran in 0.01 s\n"
+      "Operator `Kernel` ran in 0.01 s\n"
      ]
     }
    ],
diff --git a/examples/seismic/abc_methods/03_pml.ipynb b/examples/seismic/abc_methods/03_pml.ipynb
index d3ca9929b1..b0ab62839c 100644
--- a/examples/seismic/abc_methods/03_pml.ipynb
+++ b/examples/seismic/abc_methods/03_pml.ipynb
@@ -179,10 +179,8 @@
     "# NBVAL_IGNORE_OUTPUT\n",
     "\n",
     "%matplotlib inline\n",
-    "from   examples.seismic  import TimeAxis\n",
-    "from   examples.seismic  import RickerSource\n",
-    "from   examples.seismic  import Receiver\n",
-    "from   devito            import SubDomain, Grid, NODE, TimeFunction, Function, Eq, solve, Operator"
+    "from   devito            import SubDomain, Grid, NODE, TimeFunction, Function, Eq, solve, Operator\n",
+    "from   examples.seismic  import TimeAxis, RickerSource, Receiver"
    ]
   },
   {
@@ -205,7 +203,7 @@
     "compx  =  x1-x0\n",
     "z0     =  0.\n",
     "z1     =  1000.\n",
-    "compz  =  z1-z0;\n",
+    "compz  =  z1-z0\n",
     "hxv    =  (x1-x0)/(nptx-1)\n",
     "hzv    =  (z1-z0)/(nptz-1)"
    ]