James, we too have Citrix installed for our remote site and it causes problems, problems, problems. The only thing I can tell you for sure is that your Citrix, Windows NT, Windows 95/98/etc., and VFP all need to be up to date on the latest patches, service packs, and updates for it to work correctly. I'd like to dump Citrix in the river but my Network Administrator would have a coronary... He thinks it's great. I think it's a piece... well, anyways...
G'Luck!
Time is a wonderful teacher. Unfortunately it kills all of its students.