THis really has more to do with performance issue with VFP and NAV, but it can't hurt to check if this is also causing your problem:

http://support.microsoft.com/support/kb/articles/Q304/4/82.ASP


>Yes all are working fine; Can connect as admin on all but this must take time because the problem does not appear at every save, it happens at ~100 recs(random)
>OOPS what with Norton Antivirus? yes there are station with Norton Antivirus 2001 and other with AVX.
>
>
>>Does each workstation running the app work OK when the others are not running the app? Can you connect as Administrator on all workstations and verify same problem happens? Is Norton AntiVirus being run on any/all computers? Other than that, I am as stumped as you are.