Hi Anne - this will almost definitely fix your issue (From Apple):
You can resolve many issues by restoring Motion back to its original settings. This will not impact your project files. To reset your Motion user preference settings to their original state, do the following:
In the Finder, go to ~/Library/Preferences—the tilde (~) represents your Home folder.
Drag the "com.apple.motion.plist" file from the Preferences folder to the Trash.
Please let us know
Doug
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Doug Suiter.
Freelance Director, Promos, Post & Creative.
LondonFCP/SydneyFCP Administrator.
Find Local FCP Operators (Sydney & London) at the FCP Talent Registry: www.FCPTalent.com