Without being 100% sure I believe the command-processing queue jammed up; an admin restarted it for me about two hours ago after I reported the inactivity suspensions that weren't lifting. That same queue also handles account creations, and it's a first-in-first-out queue system so if it gets stuck, nothing would run through until it got restarted. Usually when it jams, it thinks a command is still processing that is actually done, so it still continues to process the commands behind it (there's multiple "workers" pulling from the queue) until it eventually realizes the mistake and self-corrects, but this round looks to have jammed them all.
It should be running smoothly again and shouldn't happen again in the near future; I don't actually remember the last time the queue completely stopped and had to be fully kick-restarted before.