It appears that Visual Studio 2010 Beta 2 does NOT compile M grammars (see http://social.msdn.microsoft.com/Forums/en-US/oslo/thread/27acda47-b937-49c1-acb4-e991c6f27c9e).I've spent a lot of time trying to understand modeling and Oslo, and find it extremely frustrating that I can't proceed, having replaced VS2008 with VS 2010Beta2. Is it possible to get a patch that will address this before the next publicly released version of VS 2010?
What distribution are you using?