Anything special about your hotkeys? Multiple commands, or are you just dragging buttons around? Does the one that crashes your client output to a different chat window than the others?
First suggestion would be to rename (or delete) that char's ui file so it gets recreated. You'll lose your window placements, hotkeys*, etc. Look for the files starting with your character name in your eq folder:
<your name>_Project1999(or P1999Green).ini
-Mcoy
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