Problems with IK Spline advanced Twist attributes
 

Hi,

I have got a bit of a problem. I would like to control the twisting of my IK spline with the advanced twist attribute. However as soon as I activate the option my skeleton twists uncontrolably several times in itself. No matter what up vector I try it is always the same. everything works fine though when I do not use the advanced twist controls. Has anyone come across this before?

To make things even stranger other spline IK skeletons, which are built exactly the same way, in the same scene work perfectly. Could it have something to do with the fact that I chose "Mirror skeleton" for the jointchains of the IK splines that I now seem to have a problem with.

Any help would be very appreciated.Thanks