From time to time, the VFP7 Debugger tool loses track of the source code for some objects on a form. It seems to happen most often when a class has been subclassed. The objects and the class libraries are in the project and the code can be accessed by the Modify button on the project, but the Trace window says "Source Not available." It doesn't happen all of the time, and code which has been lost while in one session sometimes (not often) becomes available in another session, even though VFP is started the same each time.

Any suggestions of what to look for or how to fic it?
-- DBK