why is my keynote crashing when i try to view in the light table?

Try this maintenance routine which has solved quite a few issues:

1

Close all applications

2

Uninstall Keynote; 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

3

empty the trash

4

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

5

go to; Applications > Utilities > Disc Utility > First Aid > Repair Disc Permissions

when this is completed restart the Mac normally

6

Reinstall Keynote using the original discs or logging into the Mac App Store and installing from there.

Post back to let others know if this helped