Updating constraints

Hey guys,

I’m having issues getting constraints to update. I find when I scrub, or even render through an animation, it takes 1, 2 sometimes even 3 frames after before a constraint key updates on the screen.

I was browsing through the BF forums, and stumbled upon this script to update all frames.

http://www.blender.org/forum/viewtopic.php?t=13751&sid=ec2641c2e51d24cfd5fd610233785095

Unfortunately It doesn’t work off the bat. And I don’t know anything about scripting, so can anyone tell me if its feasible to make a script that updates all the constraints whenever frames get scrubbed? And no delays either?

Thanks