>Everything you mentioned is true except the last one (anti-virus) - which I do not know the answer to, but I will check. However, this is a very large company and things such as this are not within my ability to change and the request would likely fall on deaf ears. Have you had experience with this causing this error before?

- AV will slow things down; how does VFP respond to file system slowdowns?
- I'm always suspicious of processes that hook into file system access. Are they buggy under heavy load such as can be applied by a long-running data-munging VFP app?

Another thing I forgot to mention earlier is index corruption. I've seen this cause ICEs. Sometimes REINDEX can help but often the corruption is subtle and can be fixed only by completely deleting the index tags and rebuilding them from scratch.