What causes all iWork apps to have blank, unusable documents after a reinstall?
I had a little trouble getting iWork '09 to work correctly on Mountain Lion.
When I tried to create a new document from template chooser, it was blank, and I could not do anything.
When I tried to open an existing file, it said it "file could not be opened".
This applied for Numbers, Pages, and Keynote.
This is how I solved it,
- Moved the iWork Folder in Applications to Trash.
- Removed
/Library/Application Support/iWork '09 - Re-Installed iWork (I had installation Media).
- Then installed the Mountain Lion iWork updates.
Hope that works for you.