PowerPoint for Mac Crashing?
Make sure you have updated to the latest version
If PowerPoint for Mac Keeps Crashing, Make Sure You've Run All Updates
You can tell what version you have by clicking on PowerPoint -> About PowerPoint. Your version should match the image below.
If Your Version Does Not Match
Run software updates several times until it does. With PowerPoint open, click on Help ->Check for Updates and then click the button that says "Check for Updates" - Do this several times.