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# 2 01-08-2009 , 09:23 PM
Registered User
Join Date: Aug 2009
Posts: 3
I've been having the same problem, and it has been particularly frustrating to me since I've been FK/IK arm rigging for a year and a half and haven't encountered this problem until now.

However, I've been looking into this and I think I have isolated my problem to the ulna rotation expression--the FK/IK arm switching worked just fine until I've implemented the ulna expression, which why I haven't faced this problem until now since I haven't had to use the expression in my earlier rigging works. What doesn't make sense is how the ulna expression affects the FK/IK switching.

By explaining my side of it, I hope I have helped you with your problem at least a bit. Let me know if you have been able to at least isolate your wonky hand twist to the ulna rotation expression. If not, then I'm afraid you have a slightly different problem that required a different solution altogether.