I just tried to update my project from CVS, but all the update options were greyed out. I refreshed the Changes panel, but no new changes showed. I closed IDEA and restarted it, then I was able to 'Update Project', but no changes arrived. I know there are changes because a CVS Diff shows them, but now the CVS Update options are greyed out again!
I now have to update from CVS using an external CVS manager... :(