A couple of people have emailed in to say they're having trouble logging into these forums to contribute to discussions. It looks like it's not just one or two people either, so my sincere apologies if this is also happening to you (please do let me know if it is so we can work out any patterns—email to email@example.com). Not being able to discuss stuff in a forum defeats the purpose of having one! So, we're onto it and won't rest until we get things working as they should.
We've been in touch with vBulletin support several times and have communicated to them how frustrating this is. They've said they're aware of the server issues and are trying to track exactly what is going on.
I'll keep you posted as things are updated.