We're aware of the issue and think it's a change that the ad provider has made today to their code, which has screwed us over. The fix, believe it or not, is to use an adblocker.
It's 10.40pm in the UK right now, so the programmers won't be online for another 10 hours or so to see if they can do anything to fix it.
Sorry for the inconvenience.
PS. We intend to make the site completely ad free for verified mod authors in the next coding run we do for 5Mods.