Parent constraints disappearing / deleting themselves

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  10 October 2013
Parent constraints disappearing / deleting themselves

Hey everyone, I'm having a strange problem with Maya that's driving me CRAZY!
I have googled and googled but had no results relating to my problem :(

This is my situation:

I'm working on an animation where a girl is running with her arms folded, so I thought I'd set up some constraints. First I parented a locator to the top spine control. I then parented 4 locators to that, one for each hand and elbow (the rig has IK elbows that you can move anywhere). All of this was done in the rig file, which is referenced into my scene file. Then, in my scene file I parent constrained the hands and elbows to these locators, and that all works fine. The whole 'arms folded' setup moves with the body, I can move and key the locators if I want to and I can make the arms go back to normal with the Blend Parents. This all works great.

This is the problem:

Completely randomly, days after doing this, the constraints just disappear! Also, if I try to re-constrain them the Blend Parents don't work anymore, and new one's aren't created, so I end up having to go back to a previous version of my file. (I tried re-connecting the attributes with Connection Editor but it freaks out and messes up the keys that have Blend Parent as '0' ) It's really annoying and I've had to do this several times now!

Has anyone experienced constraints just disappearing? Is it to do with the fact that the rig is referenced in, but the constraints are in the scene? The amount of time I've spent on this 'time saving scheme' has definitely NOT saved me time, lol. Any help would be greatly appreciated!

Thank you,


P.S. I am using Maya 2013 on Windows.
  10 October 2013
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