Peter,

That **IS** a nasty nasty one!! And I regret that I can't help with a solution. However, the following additional information may help others who can. . .

1) Are the workstations all shutdown properly nightly or are they left alive (assuming the application itself to be shut down regardless)?

2) Does your FPD application use TTS in its processing? Does the VFP5 application use VFP TRANSACTIONS?

3) When you say nulls, am I correct in assuming that you mean hex00?

4) Has the problem been found to be related to any specific workstation OS? If so, what OS, and if not, what OSes are known to see this problem happen?

5) Do the servers in question support and use ECC RAM?

6) Do the servers in question all support L2 cache for the full extent of the RAM installed?

FYI, I was once involved with a most nasty problem on a Novell 3.12 system that we chased for several months and which caused bad index corruption regularly (daily or more) causing application shutdown to "fix". In THAT case it turned out to be (believe it or not) that the server (Tricord) was not (at least that model, at that time) certified for Novell!!! Once we learned this we replaced the server and never saw the problem again.

good luck
Jim