Quote Originally Posted by starl
Here's version info from the problematic client:

There was a system update for Macs. I'm running 10.3.4 now. Maybe
that's it.. Also, I'm on XL version X
Okay, that last part might be the clue. There are two Excel versions for OS X. The earlier version for OS X was called Excel v. X. I have read that it occasionally had problems with some cross-platform work. I had never upgraded to it, but went directly from 2001 to 2004.

I will check a few sites and try to determine whether that is a problem.