Try this maintenance procedure for keynote which has solved many issues.
Every stage must be completed in performed in the following order:
Close all iWork applications
Uninstall all the iWork applications; this must be done with an application remover tool to delete the installation properly. Appcleaner is known to work correctly for this purpose, it is free and can be downloaded from here: Appcleaner Download
empty the trash
shutdown the Mac and restart. After the start up chime, hold down the shift key until the apple logo appears
let the Mac complete the start up procedure completely, it will take longer than usual as the hard drive is being repaired
go to; Applications > Utilities > Disc Utility > First Aid > Repair Disc Permissions
when this is completed restart the Mac normally
Reinstall iWork or Keynote as appropriate using the original discs or logging into the Mac App Store and installing from there
Post back on your results.