Thanks for responding quickly.  After reading about how other users solved their QB Amex download problem, I removed the feed from QuickBooks, then recreated it, and it worked.  This seems to be a fairly common issue; users should not have to fix it this way  or be sent to Amex to try to resolve the problem.   

I'll try rebuilding my data file to see if that fixes the other recurring issues when I have a chance  I've already spent too much time the last several days trying to fix QB issues and need to focus on running my business.