Only things I can think of is out-of-date flash player or faulty hardware...
If your flash player is all up to date, then I would suggest calling Apple.
Oh, and I had a problem with my iSight that was mechanical and brought it back within the 2 weeks so if you bought your computer within 2 weeks, I would say you should bring it to an Apple store (if your Flash player is all good) and show a Genius the problem and they are likely to exchange it providing you have a receipt.
Hope this helps a bit 🙂