Sorry, I don't have an answer, but more questions. I'm having the same problem. I've scoured every resource I can think of. My DB has always been on Win7, Access 2010. I've been writing it for about 6 months. Sporadically it opens as ReadOnly. It's on a single user PC (no network). Have you found any answers? Everything else works perfectly. I make sure all forms, reports, DAO connections, EVERYTHING, are all closed when exiting. There just doesn't seem to be any predictable pattern to it.