Today I purchased and downloaded Numbers. For one user account on this iMac, Numbers and Pages have stopped responding!?! I've read lots of similar threads from years gone by, but nothing recent. I'm running a new iMac with the lastest Mountain Lion OS; everything is up to date. Any ideas?!?
Thank you all for your support and responses. It all helped!
While exploring various forums and chat sites I discovered two things: First, if I turned off iCloud the iWorks apps worked fine, specifically if I turned off Documents and Data; second, after changing iCloud settings and logging off, I discovered the settings unchanged when logging back in. Another post mentioned the permissions associated with the User Library folders and their children. Similar to what Jeff mentioned above, I had changed the Administrator setting for other accounts between installing Pages and Numbers. I suspected that the Library folders were not allowing the user accounts to modify various files; so I changed the permissions on the User Library folders such that the user and admin (me) had read & write for all the content. That fixed everything: Changes to settings stick and the iWorks apps are functioning. The whole iMac is a bit snappier, too. I suspect my admin change had things pretty hosed up.