I right clicked on one of my green test coverage dots and selected to "Show tests covering this line". Then when that window showed up I decided for whatever reason to try to move that window by dragging it's title bar to see if I could dock that window. The result is that now every time I open that window I get a window of varying size that has no contents.
Disabling and Re Enabling NCrunch DOES NOT resolve the issue.
Restarting Visual Studio DOES resolve this issue

Setup VS 2010 (VS 2012 also installed)
ReSharper 7.0.1
NCrunch 1.41.0.50b
Let me know if you need details.
Thanks,
Mark Smith