Using VS 2005, I have managed to create a test project - once. No matter what I do now the creation of a new project fails with a warning dialog:
The project code model is not fully loaded. This problem occurs with the console project, reloading solution may fix it.
I have deleted the ncb file and shutdown\restarted VS to no effect.
BTW: good job - this is a great add-in.
Aside: if\when you decide to refactor, the tree view to select the test class takes an age to load (over a minute for me) on large projects. It would be quicker to display breadth first and then dig deeper on demand as the user selects a class.