Earlier this evening I attempted to set up a Dungeon using Symbol Set 2 and Dungeon Designer 3. As I started to add doors, I decided that rather than use the Bitmap A doors, I'd rather make use of the default DD3 Color doors. However, after loading the appropriate catalog (Wall Enhancements from the DD3 Color folder) the doors failed to snap to the walls, no matter where I moved them. Switching to the Symbol Set 2 Bitmap A doors seemed to fix this problem, as I was able to place doors in the same spots as where the DD3 Color doors refused to recognize a wall.

Is there a limitation on mixing and matching catalogs?