Repair the disk permissions before preceding.
Use this free app to remove Motion 5:
FCS Remover from Digital Rebellion
Make sure you only select Motion 5. After you remove Motion 5, reinstall the app again from the App Store. When all is said and done, repair the disk permission.
Try this before trashing Motion.
Some people were having problems with the canvas not showing up in Motion 5:
This may or not work for you.
David, Thanks for the assist. Arbitrarily the HUD decided to reappear after one last plist trashing / reboot. Now I have the problem of Motion 5 deciding that all imported media should be a minute and fifty two. Having no luck fixing that, other than creating a new project, which would suck as I've got dozens of layers...
BenB, Thanks for the response I answered your questions on new Thread: Can't change clip duration Motion 5 https://discussions.apple.com/message/20302638?ac_cid=op123456#20302638