this only happens infrequently and therefore is hard to duplicate. Failure: the cursor will be on a fn or var in an editor window, I select "ctrl /" - the cursor will move to a random place in the file in the Editor Window, but the Next Reference will be in the References Preview window.
I tried your suggestion of "Hide Preview Window", so far so good.
Edit: nope, Hide Preview Window did not fix the problem - when this occurs, the cursor in the Editor window just goes to a random place, and the context is not in the Editor window. In the References window, the highlighted reference increments as I step <ctrl-g> thru the references.
Thanks,
namklak