>Make sure that they all use separate resource files (foxuser.dbf). You can find the current resource file name/location by issuing

? SET("RESOURCE",1)

or by going to Tools -> Options -> File Locations -> Resource File.
>

SET RESOURCE is off for the testers. The development machine has one, but it's not in the path when the .exe is run. Uhh, scratch that. Looks like it's finding the FPD foxuser on my machine.