When a prg is compiled an fpt file is created which holds all the object code. If these files get out of synch then you'll get that error. When a method is closed it is automatically complied and the object code is put in a memo field in a database. I suppose if the memo field that holds the ascii code gets out of synch with the memo field that holds the object code you will get this error message as well.

The most likely reason you are only occasionally getting this message is becuase on those occasions you are running either an app or and exe file. You cannot debug and app or exe file.

Rip