Need working collada animated file, or someone with Debug version of Unity

I have a Collada exporter for my modeler/animator. It can now export models that correctly load into Unity fully textured with texture transparency, bones and weights.

If I add animation, the model loads and will play the animation once (default), but if I make ANY change and hit reapply, it errors and model disappears. So I can not segment the animation.

I got this far by finding working Collada files so I could figure out the additional requirements that the Unity loader places on Collada files (in addition to the Collada standard).

I have not been able to find any Collada file with a skinned mesh and animation that Unity will load. Does anyone have one, and can I get one from Unity dev team?

Watching them load and then vanish is very frustrating, to just get a general error message.

Where can I find someone with a debug version of Unity who can tell me what is the issue the loader is having with these files?

Thanks, David