After upgrading from SilverLight 2.0 Beta 1 to SilverLight 2.0 Beta 2 I started receiving the following strange behavior.  The project would compile just fine (and execute with no issue), but he design view of my XAML page stopping showing the preview.  Although the project compiled just fine, with zero failures, if you look in the error list, you would see an error.

AG_E_UNKNOWN_ERROR   in file Page.xaml

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Don't just install SilverLight 2.0 Beta 2 overtop Beta 1, despite what you might hear from people for whom it worked.  You may encounter this problem, posted by Tim Anderson.

http://www.itwriting.com/blog/?p=665

Hopefully you won't have a problem, or if you do the process of uninstalling and installing again is easy enough of a solution.  However, if you are like me it won't work and you should follow these steps, posted by BradleyB.

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In both SilverLight 2.0 Beta 1 and Beta 2, I've experienced the situation where my break points are not being hit, while debugging my application in Visual Studio 2008.  It took a few attempts at figuring out why this was happening, but the answer was to clear the browser cache.  I have not determined exactly what causes the browser to cache the SilverLight application.  It appears to happen only intermittently for me, with a need to clear the cache a half dozen times a day. 

Notice that your break points will have a question mark on them, when the browser is running the cached version.  Additionally, of course, any recent changes you made to the application won't be reflected, when running the cached version, despite a browser refresh (F5).  You must go into the browser (IE6) options and clear the cache, then refresh.