>Security issue? Do the users have enough rights in F:?

Well, they have 'read' writes only in that folder. The weird thing is that they can run the program from f:, but not from c:\. Other users with the same rights can do this no problem. I've actually gotten around the problem by running all programs from a sub folder in c:\ which is better anyway. A program runs fine from c:\vfpapps, but errors out from c:\.