I know there have been two times when it hasn't worked, once when I found a tag that I hadn't seen before, and once when we actually tested it a few minutes ago.
There seems to be a problem with the premium system. Mine supposedly expired 50 minutes ago yet I still have the badge and can still access the infield.
I have the same issue as @haitch40 with my premium having expired and still having access to the infield but being unable to renew my annual subscription. I only get the option for lifetime in the account upgrade page. The yearly option just says 'Expired 24 minutes ago' next to it.
Edit: The option for yearly is now available again.
I've gotten word from a few members that they're having trouble with GTP randomly requesting them to confirm their emails again, not letting them post. The problem is that nothing's being sent to the members' emails for them to follow up on it. So they're stuck not being able to post, really weird.
I know, right now, @LMSCorvetteGT2 is having this trouble, but there are definitely more.
@haitch40 @Solo Yes, there is a known issue with Premium subscriptions not expiring.
@Wardez You can refer them to this section of the FAQ, which explains what is happening and how to fix it. They'll probably need to contact me, as it sounds like I'll need to manually remove the blocks on their email addresses.
I'm going to close this thread, but will continue updating the original post as new problems are resolved.