Yes, I know exactly what is causing your problem.  It is that you disabled 'use constraints'.  This sounds like it would be a good thing to get rid of those nasty rotation constraints, unfortunately in Carrara, it also turns off the translation constraints on the model, which allows some poses to pull joints, like Vickies shoulders, out of their sockets.  It also makes IK use impossible.  Unfortunatly, while this is REALLY annoying, it is working as intended, and the only way to manually fix it is by zeroing the figure and then going body part by body part and disabling the rotation limits, or reactivating the translation limits.

I wish they would devide up the functions of that 'Use Constraints' button so that so you could choose which set of Constraints you needed enabled.  I don't know why you or anyone else would want to disable the Translation Constrants, but I'm sure there is a reason