Could you zip up two of your design files and email them to me? There is something different about your design compared to the simple designs I test with, and I think I need to figure out what it is.
I would only need the game.dat and levelxxx.lvl file, the level file that contains the events you're having the problem with. The xxx part starts with 000, so level 1 is level000.lvl. No need to include art, sound, or other design files.
The email to send to is
CocoaSpud@hotmail.com
It would be a big help towards discovering the cause of this bug.
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CocoaSpud
Dungeon Craft Development Team
http://uaf.sourceforge.net