I have created a test machine with Win 7 ultimate x64, Visual Studio 2010 sp1 and IA 2012, but I am not able to replicate the issue.
I suspect that exist some other things causing a possible conflict, as packages or eventually other possible addin.
The above test machine has been released creating a VM clone of my actual development machine.
So my Visual Studio installation is quite extended in terms of additional components, packages, addins, TFS, WIN SDKs and so on.
I will repeat creating another test machine from scratch, hoping I will be able to replicate it in this way.
I am totally sure that you are experiencing a real issue, but you should provide me any other possible information.
Otherwise it will be very hard to find out what really happens.
If someone of you have the opportunity to create a VM machine that could replicate the issue it will be very appreciated.