This is a nasty bug indeed. It happens rarely and sporadically, and I have still no idea why/how. What is written in the forum thread you’ve mentioned still applies. BTW: I was able to repair the posters DB the same day. At the moment it’s not possible for users to do the repair on her own.
Can you help investigating this error by systematic experimentation? If you could provide step-by-step instructions by which I could reproduce the bug (on a pristine DMX installation), that would be hugely helpful.