Do you have any combat-related items (hits, misses, spells, etc) going to a separate chat window? If that window is set to an invalid size it can cause a client crash whenever it tries to write to it.
Since you're fine on other characters, you can rename your affected character's ini file (from .ini to anything else) and it will regenerate a new one when you next log them in. If that works then you know you have something incorrectly set. Delete the newly created one, rename the original back to .ini and tweak it.
-Mcoy
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