>I'm getting a C5 error whenever I try to open either the Debugger or the Breakpoints dialog from VFP menu options. I tried deleting all records in FOXUSER that have "DEBUG" in the ID field. Didn't help. Deleting the FOXUSER files altogether solves the problem, but then I lose everything else in there, which is not highly desirable. Any ideas on what other records in FOXUSER might be the source of the problem?

Did you also try CLEAR DEBUG

?