Hi Bill.
I'd suggest upgrading to the current version of ProAnimator - currently at v4.5.1. There were issues in previous versions when trying to copy the temporary render file to the final file name.
Note: If the final file name is Animation.mov, we render to Animation.mov@ and then rename it to Animation.mov once the animation is complete.
You can get the latest and greatest here:
http://zaxwerks.com/download
Matt Rhodes
Zaxwerks, Inc.