>> A simple M-x grep-find on .org files for the year should work. > > I do not know the year.
That is what regexps are for. If you visit the org file and do M-x occur RET [<[]19[0-7][0-9] RET you are likely to find all entries in the 1900 and 1979 range. It is not my intention to provide you with a outright solution but only to give sufficient hints so that you make progress. >> You may also try >> M-x debug-on-entry RET ding RET >> Look at the backtrace and see whether you can get some clues. > > Sorry, no clue. > >> Works best if your orgmode is not compiled > > When I have compiled Orgmode, should I delete all *.elc files? May be the debug-on-entry is the wrong strategy for the problem at hand. You may disregard my suggestion. --