Hi Jim-H,
I just downloaded all the files to check it.
I can reproduce the same result here with MACOS 10.9.5 and C4D R16.027. See [left] image.
You might get into contact with the support. http://www.maxon.net/support/support-questions.html
However, the Picture Viewer in R16 as well in R15 isn’t able to open it, which seems rather odd, and lead me to the idea that something outside of C4D might cause it.
My workaround, I loaded the mp4 footage into After Effects and exported it with no change as JPG sequence. (I’m not a fan of JPG nor 8bit/c, but the format was only mp4, and JPG will work fine for the tracking at 100%-Quality of course.) Works fine, see [right] image.
Set the time for the project as a sequence has no idea about.
This works fine. If you encounter any other problems, please let me know.
All the best
Sassi