We've been running an old 2.x version of phpBB for some time now. I decided it was time to upgrade after one of our customers experienced some trouble with a post and there was little I could do to help due to the age. Hopefully that problem was fixed sometime between that old version and this current 3.x version, but this upgrade was something I'd been putting off for a while and meaning to get around to. As with any major upgrade, especially one that changes the interface quite drastically, I'm sure this was a surprise if you're seeing it for the first time. But the old theme is no longer available in this version of the forums, so hopefully everyone will adjust in time.
If you have any problems or questions please let us know. Thanks!