Ive never heard of that bug, so IŽd suggest the standard sollutions
:
1.- Install the latest patch if you dont have it
2.- Load a previous game, though i dont really think this will help
3.- Maybe empty your "override" folder, maybe there is a corrupted file over there
4.- Uninstall & reinstall
thats all i can think of now
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"I wish my Angel was here... I fear nothing with her" -Ertai, Captive of the Blinding Angel