I don't have the full details, but apparently he quit head-case, and apparently his quitting head-case had some deleterious effects on anything he had to do with, including threads started by him (I would say this is a bug with the software). Seems it deleted your PM thread, too. Sorry, that was nothing done by us in retaliation or anything, it was an unknown and undesirable side effect of his leaving -- he probably would have done things differently if he had known. We don't have a solution for bringing it back.