I have a similar issue with Design Review API on 64 bit machine with Visual Studio 2010.
I can add the DWF Viwerer Control to a form, and it does appear, but then crashes Visual Studio.
Like others my app was working on 32-bit Visual Studio 2008, but not anymore.
The problem I describe happens even with a brand new Visual Studio Project(x86, .NET 4.0)
Please try the resolution posted by Jens in this thread.
Hope that helps.
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