I am having a lot of issues witht he Silverlight Player. I am running SL version 3.0.40818.0. I have been having this same issue on multiple machines, 2 Windows 7 and one Windows Vista. I have confirmed that it is happening in both FireFox (3.5 and 3.6b1) and IE8. I have a feeling this may be related to VS2010 Beta 2. Which I have installed on all machines. .
The video never lines up correctly within the box. Depending on where I have the browser scrolled it gets offset. It doesn't really play either, it shows a random frame every 15 seconds or so. Sometimes it never shows up at all, it remains black. In both browsers if I double click on the box it will go to full screen and work correctly. When I exit full screen it will still be broken in the page.
Below are screenshots of what I get.
FireFox:
Internet Explorer 8:


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