Symptom
When you try to select a theme in Keynote an alert with this message appears:
"Keynote can't apply the theme /resources/keynote.app/contents/resources/themes/<themename> to the current document because there is a problem with the theme".
Solution
Check to see if Hebrew is the preferred language in the International preference pane:
1. Choose Apple > System Preferences.
2. Choose View > International.
3. Click the Language tab, if necessary.
4. If Hebrew is the first language listed in the Languages area, drag English, French, or Spanish to the top of the list so that it becomes the preferred language.
5. Choose Apple menu > Log Out.
6. Log in.
Keynote should now open themes.