I cannot make this happen. I tried the events you mentioned and inserted several times. I tried the normal events, step events, and rest events. No luck causing the same problem though.
I'll keep trying, but if I can't reproduce it I won't be able to fix it in the next release. I'm sure it must be a particular set of circumstances that lead up to this, I just need to figure out what they are.
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CocoaSpud
Dungeon Craft Development Team
http://uaf.sourceforge.net