Don't panic, it's not you!!
The webhost for the site is in the process of upgrading and moving the site to new servers and that has meant a lot of work (and blood, sweat and swearing) on my part to get everything ready for the change. That has meant some serious upgrades to the software running the forum which means lots of backend changes and a couple of frontend changes. The frontend changes are purely cosmetic at this point as I now have the forum running correctly.
I actually have my left arm in a sling at the moment, after an accident, so I have been doing this one handed, just to add to the whole thing. I just need to take a little time to decompress after the upgrade before I tackle the cosmetics. I promise I will have the forum back and looking the same, or better, in the next day or two.
Greg