The markers were displayed correctly but not responding to mouse events. I've experienced this multiple times with version 1.42, but it's the first time I experienced this since upgraded to 1.43 about 9 days ago.
I tried resetting NCrunch, restarting VS, renaming the test method, but didn't work. At the end I fixed it by adding another test method to the same test class.
Thanks Yang. If you see this happen again, could you send through a bug report? I have a feeling that the click event may be throwing an exception of some kind, and the bug report should be able to show me this in the included log file.