Hmm, I'm not a Citrix expert. Sounds like something's generating a GPF or C5 while in VFP.
Are you limiting RAM use via SYS(3050)? Does each remote session have enough?
Are all the Citrix servers identical? Could it be a video driver issue with them?
I think some Microsoft and Citrix hotfixes are referenced here in various threads if you do a search, e.g.:
Re: VFP 7 on Citrix Thread #
647612 Message #
648050Re: No BitMap setting stopping objects being refreshed Thread #
530345 Message #
530353Re: Error 1104 at a Client Thread #
563475 Message #
563751If you're previewing reports be careful of file handle leaks:
http://support.microsoft.com/default.aspx?scid=KB;EN-US;Q216587&
Regards. Al
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