None of my iWork apps will open.

Question

I have a 21.5" iMac at work.  It is running Mac OS X Mavericks (10.9.5).  The computer is brand-new; I received it at the beginning of September, and it was purchased specifically for me so it is the latest model iMac.  I use a combination of iCloud and Google Cloud Drive to store the majority of my documents and sync them between home and work.
Today I tried to open all three iWork applications and none of them would open - or, more accurately, they wouldn't beyond the "new documents" screen.  The same thing happened/happens with all three.  I would go to Launchpad or the applications window and hit the app; I would get the "iCloud for Pages/Numbers/Keynote" screen.  If I hit new document, then I get the template chooser, but when I choose "blank" (or any template - it doesn't matter) and then hit Choose, nothing happens.  I can do this 4-5 times in a row and nothing happens.  If I then switch to use another app, the iWork app will close spontaneously.  The same thing happens if I hit cancel and then try to create a new blank document using the File menu in any iWork app.
If I try to open an existing iWork file, I get the message "[filename] cannot be opened."  This happens regardless of whether I double-click the file within its folder or whether I try to open it directly from iWork using the menus.  Even if I try to open a Microsoft Word document in Pages by right-clicking and selecting Open in...Pages, I get the same message.  I don't have this problem with any other applications on my computer; when I go to the App Store, the applications show as installed on my computer.

Answer 1

I am having the same problem with my iWorks apps on my iPad (but not my iPhone). I am hopeful the update to iOS 7.0.3 will fix it. I have been searching this site for solutions but had not found anyone with the same problem until now. Thanks for the second post. It gives me hope!