Have you copied the files to a new location recently? Anytime I have moved a project to a new machine (or even restored from a backup) the first thing I do is issue a "compile *.prg" statement to "reconnect" the compiled code with the source. It saves me a lot of time recompiling individual source when I happen upon it later. (if you happen to be in Fox 2.x, it's a good idea to do the same with the .spr screen code as well.)

Steve