About 10 minutes ago I switched the forum database to a different format to prepare it for additional upgrades in a few weeks. Consequently, all users must re-login upon coming to the forum again. Let me know if you encounter any problems with topics not appearing and such.
Also, check your profiles in your Control Panel to ensure that all of the data are still present. Birthdays will probably need to be reset, but other than that everything *should* have remained intact. If not, fix it
A small additional note is that topic subscriptions may vanish or appear without warning. If this happens, simply resolve the issue through your Control Panel by adding/removing the relevant subscriptions. There's a help file available to give you a hand if you get lost in there.