No need to be sorry, keep those bug reports coming
The cost multiplier sounds easy to reproduce and fix.
The event editor problem may be more troublesome. Were you inserting the event at the root or in between other events? Do you recall the event on either side of the insert point? Not sure it makes a difference but I cannot make this happen for me. This is a serious bug that needs high priority attention though. Nobody else has reported this problem.
Another question, did your events come from importing a UA design or was the event chain totally created yourself?
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CocoaSpud
Dungeon Craft Development Team
http://uaf.sourceforge.net