I have the same problem, and at the worst possible time as I'm away home and my main computer and I need the Numbers / Keynote documents in the cloud and I can't do the reset :-/ The documents - or some of them - appear in generic icons and the updates are frozen
UPDATE: By any chance, have you installed Yosemite (beta), or iOS 8 on any applicable devices? When you log into iCloud.com, are the applications (Numbers / Keynote / Pages) marked "beta"? When you click on any of them do you get the msg: "Sorry, you can't use (the application) with this account right now. You've upgraded this account to iCloud Drive. iCloud Drive will be complete with (the application) for iCloud later this year."
I had a conversation with Apple support, and it appears that since I installed the public beta of Yosemite, my iCloud account has been upgraded to iCloud Drive, which is currently not fully active.
I'll attempt to logout of iCloud on the Yosemite device and see what happens next.