As of this morning, I see that the account access issue I've been having has finally been resolved. According to the vague explanation I received from customer service, the migration of the databases that run this forum and the UMDB were only partially migrated. The data itself was migrated, but there were some other steps that they were having issues with that caused the slowness and the occasional error messages (such as "Too Many Users") that we've been seeing. Now, if all the loose ends have been tied up, the issues should stop occurring. Or so I've been told. Time will tell if this is actually the case. I'm providing this update with hope, but not with confidence.