MDG for Visual Studio: Missing active projects

[Beni]

I am currently evaluating Enterprise Architect including MDG Integration for Visual Studio 2005. If i want to connect a Project with a package (Right mosue click on package -> Add-Ins->Connect external Project -> Visual Studio), the list of active visual studio projects is empty, but i do have projects in my solution. neither  click on browse and locate the solution file manually helps. Any Ideas?

[Beni]

I just came across an error logfile of the MDG Link for visual studio 2005 (C:\Documents and Settings\Application Data\Sparx Systems\VSNetLink\ErrorLog.txt). There is an error:

System.NullReferenceException: Object reference not set to an instance of an object.
  at Vsip.VSIntegrate.z.a(IVsHierarchy A_0, Int32 A_1)

Any help would be much appreciated, since i am evaluating this product and would like to proceed!

Thanks