>>>Everything is in the path, but it still gives me Source not available :((
>>
>>Have you included the debug info in the application?
>
>Yes, since it works from its own directory. Anyway, I gave up and I'm testing it from its own directory now. Unfortunately, the code is overcomplicated and very deep, so I clicked run to cursor at the wrong place now. I'll try again.

Then it's a pathing issue, probably involving the application's home directory. It might also be some module re-setting the path, then not restoring it. For example, a routine to check for the existence of a file might set the path to a null string to force VFP not to search its path. Proper coding technique dictates that if a routine changes the environment, it should restore it prior to completion.