Thanks for the reply.

Thinking this was the case we actually ran the software on a machine with a C: Drive only. This was O.K.

The problem is further hampered because we were told about this a while ago and to try and eleviate the problem we moved all our software (i.e. Foxpro 2.6 and Bespoke PRG's) onto the C: Drive of all our Development PC's.

This has helped the majority of our 150 sites. However, every now and again it reoccurs. We are now left with a spurious problem on 3 sites but can't work out what the trigger might be.