I just started trying out the mvc-mini-profiler in my MVC3 project with EF4.1 and after changing MiniProfilerEF.Initialize();
to MiniProfilerE
If it helps, the EF team have release a beta preview with a fix for the error
The given assembly name or codebase was invalid. (Exception from HRESULT: 0x80131047)
See http://blogs.msdn.com/b/adonet/archive/2011/09/28/ef-4-2-release-candidate-available.aspx
You can get it from Nuget using
PM> Install-Package EntityFramework.Preview
I just tested it on my build and it fixes the issue meaning you can just call MiniProfilerEF.Initialize();
as before instead of the new method.