Miss Nancy:  

Thanks for the feedback.  Disk space is not a problem.  I have plenty.  I tried decreasing the frame size to almost half the original but had the same problem.  BTW I misspoke in the original post.  After rendering the last image, the mouse pointer goes back to an arrow, but I cannot use it to actually click or move anything on the screen.  It's as if it gets stuck one the last step of actually creating the avi.

Anyway, can you recommend a good app to create video from .tifs?

Thanks again.