Mp4 audio but no video

Just installed the newest version of QuickTime and now my Camtasia produced mp4s will not play the video.  Is there a fix?

Do you get that if you view any videos on the PC? (Including the QuickTime sample movie down in your program files?
Here's a screenshot of where to find the file on a 64-bit system:
(On a 32-bit system, the \QuickTime\ folder is in \Program Files\ rather than \Program files (x86)\)

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