Was about to give up (I tried a ticket, they wrote back 3 days later saying I had to call, wasted the hour on hold to get no satisfaction at all when I did get as chance to talk to someone) when I caught something about all worlds being open in the few minutes when a "world" maintenance concluded. Poked around for some data and saw it can end up to an hour early from the stated end time, for mine it was 7AM, so I was at my computer at 6AM. 20 mins later (kept trying over and over) BOOM, I see ALL worlds open, called up my saved profile and got right in.

THE trick is to get ready at least an hour beforehand and keep plugging. My bet is that 5 mins after I got in, the restrictions went into effect, so you're trying to hit a very small hole in time...