When opening a Visio document within the solution explorer of Visual Studio 2010 RC, Visual Studio crashes immediately. Windows starts searching for a solution after which I can choose 'Debug'. Since I have Visual Studio 2010 and 2008 I get to choose my debugger and there I see the message: "an unhandled win32 exception occurred in devenv.exe ". The number changes everytime.
I have Windows 7 Professional x64, Office 2010 Beta x64, Visio 2010 Beta x64, Visual Studio 2010 RC and Team Explorer 2010 RC installed.