I've been using AVCHDCoder to convert mkvs to AVCHD discs, and have had no problems up until now.

Today I loaded an mkv which has no chapter list, and AVCHDCoder automatically added a list of chapters every five minutes. I would usually accept that, but on this particular film I wanted chapters in specific places, so I deleted that list and wrote another. But the program won't let me save MY list of chapters, saying "There appears to be an error in your chapter list". I cannot add the movie to my encoding queue unless I revert to the five minute chapters which I don't want. Has anyone else encountered this and know how to get around it? I can't figure out why the program has an editable chapter list if it won't accept my edits.