Thread "peek" popup transparency "bug?"

When I mouse over subjects in a forum there's a popup that'll show the first few lines of the first post, but as of late (not sure when) this popup is broken, it's background is transparent so you see everything behind it as well;
luw0DTe.png

I've got this bug in the latest versions of both Firefox and Chrome on Mac OSX 10.8, think I've seen it on Windows too but I'll check that later today and add to the thread.
 

How much money have you spend on your current simracing hardware

  • €0-150

    Votes: 90 19.2%
  • €151-500

    Votes: 123 26.2%
  • €501-1000

    Votes: 80 17.1%
  • €1001-1500

    Votes: 42 9.0%
  • €1501-3000

    Votes: 47 10.0%
  • €3001-5000

    Votes: 23 4.9%
  • €5001-10000

    Votes: 30 6.4%
  • I stopped counting a long time ago

    Votes: 34 7.2%
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