This problem does not occur in the tests window, that works fine and I am able to resize columns with no problem there
I disabled ncrunch, restarted visual studio, and then enabled ncrunch. The problem appeared to be fixed for a minute, I was able to resize columns and select 'best fit'. Then it went wrong again, in this screenshot, the 'Target' column and the two to the right of it cannot be resized, either by dragging or by selecting 'best fit'. The 'Task', 'Status' and 'Priority' columns can be resized by dragging only, 'best fit' has no effect.
I think the first time I used it it was OK for a short time then went wrong.