Look in your log folder. Odd as it may sound there might be something going on with your character log (too big or who knows)? Delete the log associated with the character that you're having an issue with.
In your userdata folder you might delete any configuration settings files for the character in question. Probably doesn't have anything to do with your crashing but who knows.
Next I'd recommend deleting your character configuration settings files and letting EQ rebuild them. Look for charactername_project1999.ini and UI_charactername_project1999.ini
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