Action Constraint Glitch

Hi all,
I have a few object, which are driven by action constraints, which are driven by bones of an armature. Apparently on some frames the constraint does not update correctly, this happen in the viewport, opengl render and final render.
Does anyone know a fix to this problem?

EDIT: I am very sorry, but I just found the fix. The “Extra Object Update” (depency graph hack) in the Relation extras solves this. Please close/remove this thread.