Welcome to the forums, dbbd.
I had a similar issue a while back with my Samsung Fascinate, and thought it had something to do with the Market's basic, well known instabilities now and then.
But I went ahead and removed my Gmail account in the application manager, cleared all Google related data and caches, including Gmail storage, etc, rebooted my device and started over with Gmail and Market.
That did it. I think that once in a while some of the items in caches just get corrupted and need to be cleared and restarted to regain full functionality.
It's worth a try.. takes a few minutes, but could remedy your issues.