I am experiencing the same thing. it looks like a no frames or lite version. It just started a couple days ago and is happening when using Firefox(which I primarily use). It does not seem to be happening with Windows Explorer.
Yes I'm seeing this same thing but only when using Firefox on Linux. Chrome on Linux looks fine and Firefox on Windows looks fine. It started a couple days ago when I was getting a parallels splash page yet deeper pages would work with a lite interface. On Monday the parallels page went away but still the formatting is all messed up.
I've attached a screenshot of the front page when viewed in Firefox under Linux.
I can not get to the main forums page using google chrome from the link up top. I have type "ww.forums.snipershide.com". Note the two "w" instead of three. Will not work if I type three "w"s.