diff --git a/src/core/display-private.h b/src/core/display-private.h
index 6dc08725e..7373a5c46 100644
--- a/src/core/display-private.h
+++ b/src/core/display-private.h
@@ -390,9 +390,8 @@ void meta_display_grab_focus_window_button   (MetaDisplay *display,
 void meta_display_ungrab_focus_window_button (MetaDisplay *display,
                                               MetaWindow  *window);
 
-/* Next two functions are defined in edge-resistance.c */
-void meta_display_compute_resistance_and_snapping_edges (MetaDisplay *display);
-void meta_display_cleanup_edges                         (MetaDisplay *display);
+/* Next function is defined in edge-resistance.c */
+void meta_display_cleanup_edges              (MetaDisplay *display);
 
 /* make a request to ensure the event serial has changed */
 void     meta_display_increment_event_serial (MetaDisplay *display);
diff --git a/src/core/display.c b/src/core/display.c
index 6995f95d1..4c45fa0f8 100644
--- a/src/core/display.c
+++ b/src/core/display.c
@@ -3636,18 +3636,6 @@ meta_display_begin_grab_op (MetaDisplay *display,
   g_assert (display->grab_window != NULL || display->grab_screen != NULL);
   g_assert (display->grab_op != META_GRAB_OP_NONE);
 
-  /* If this is a move or resize, cache the window edges for
-   * resistance/snapping
-   */
-  if (meta_grab_op_is_resizing (display->grab_op) || 
-      meta_grab_op_is_moving (display->grab_op))
-    {
-      meta_topic (META_DEBUG_WINDOW_OPS,
-                  "Computing edges to resist-movement or snap-to for %s.\n",
-                  window->desc);
-      meta_display_compute_resistance_and_snapping_edges (display);
-    }
-
   /* Save the old stacking */
   if (GRAB_OP_IS_WINDOW_SWITCH (display->grab_op))
     {
diff --git a/src/core/edge-resistance.c b/src/core/edge-resistance.c
index 8409ff8b2..34be3bbbd 100644
--- a/src/core/edge-resistance.c
+++ b/src/core/edge-resistance.c
@@ -63,6 +63,8 @@ struct MetaEdgeResistanceData
   ResistanceDataForAnEdge bottom_data;
 };
 
+static void compute_resistance_and_snapping_edges (MetaDisplay *display);
+
 /* !WARNING!: this function can return invalid indices (namely, either -1 or
  * edges->len); this is by design, but you need to remember this.
  */
@@ -550,7 +552,9 @@ apply_edge_resistance_to_each_side (MetaDisplay         *display,
   gboolean                modified;
   int new_left, new_right, new_top, new_bottom;
 
-  g_assert (display->grab_edge_resistance_data != NULL);
+  if (display->grab_edge_resistance_data == NULL)
+    compute_resistance_and_snapping_edges (display);
+
   edge_data = display->grab_edge_resistance_data;
 
   if (auto_snap)
@@ -671,7 +675,8 @@ meta_display_cleanup_edges (MetaDisplay *display)
   MetaEdgeResistanceData *edge_data = display->grab_edge_resistance_data;
   GHashTable *edges_to_be_freed;
 
-  g_assert (edge_data != NULL);
+  if (edge_data == NULL) /* Not currently cached */
+    return;
 
   /* We first need to clean out any window edges */
   edges_to_be_freed = g_hash_table_new_full (g_direct_hash, g_direct_equal,
@@ -938,8 +943,8 @@ initialize_grab_edge_resistance_data (MetaDisplay *display)
   edge_data->bottom_data.keyboard_buildup = 0;
 }
 
-void
-meta_display_compute_resistance_and_snapping_edges (MetaDisplay *display)
+static void
+compute_resistance_and_snapping_edges (MetaDisplay *display)
 {
   GList *stacked_windows;
   GList *cur_window_iter;
@@ -952,6 +957,11 @@ meta_display_compute_resistance_and_snapping_edges (MetaDisplay *display)
    */
   GSList *rem_windows, *rem_win_stacking;
 
+  g_assert (display->grab_window != NULL);
+  meta_topic (META_DEBUG_WINDOW_OPS,
+              "Computing edges to resist-movement or snap-to for %s.\n",
+              display->grab_window->desc);
+
   /*
    * 1st: Get the list of relevant windows, from bottom to top
    */
diff --git a/src/core/workspace.c b/src/core/workspace.c
index 446b13537..36d620ffc 100644
--- a/src/core/workspace.c
+++ b/src/core/workspace.c
@@ -478,6 +478,10 @@ meta_workspace_activate_with_focus (MetaWorkspace *workspace,
   if (workspace->screen->active_workspace == workspace)
     return;
 
+  /* Free any cached pointers to the workspaces's edges from
+   * a current resize or move operation */
+  meta_display_cleanup_edges (workspace->screen->display);
+
   /* Note that old can be NULL; e.g. when starting up */
   old = workspace->screen->active_workspace;
 
@@ -713,6 +717,11 @@ meta_workspace_invalidate_work_area (MetaWorkspace *workspace)
               "Invalidating work area for workspace %d\n",
               meta_workspace_index (workspace));
 
+  /* If we are in the middle of a resize or move operation, we
+   * might have cached pointers to the workspace's edges */
+  if (workspace == workspace->screen->active_workspace)
+    meta_display_cleanup_edges (workspace->screen->display);
+
   g_free (workspace->work_area_monitor);
   workspace->work_area_monitor = NULL;