funny what happen here… my left arm gets broken when try rotate and sometimes refresh rig worked till dont work anymore , the funny things comes when if i hide the polygon skinned with the rig, then the bones works good…if i show the polygons start some calculation that make the bones break… anybody found same problem?
setup machine bug or.....
system
#2
ok always happen same , can be hours tweaking what happen and when post here i see the problem after 5 min 
. the problem is i have a blendshape correction in the arm , and i did a set driven key where the bone was the driver , seems that conection of the bone with the blendshape is not very very stable…even if the other arm have same setup and works fine…
berniebernie
#3
maybe it has something to do with post normalize in the skinning options ? (the way maya only calculates skin when you are animating)
try to rebind your skin in ‘interactive’ not ‘post’
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