also this quicktime movie is at a 4K resolution
That sounds a bit like it might be a bug. You should file a bug report :Adobe - Feature Request/Bug Report Form
If you want continued troubleshooting help, more info (like exact version number of your AE CC 2014) would be useful. See this: FAQ: What information should I provide? Has this worked in other versions of AE? (Can you test it in older versions if you haven't already?)
Im running AE CC 2014.2 which is version 184.108.40.206 on windows 7 professional service pack 1.
I tried the the same clip in versions CC, CS6, and CS5 and got the same result as in cc 2014.
I had the artist who gave me the clip make a 1920x1080 version of the quicktime for me, and that worked no problem.
It seems the issue arises when the clip is at its native aspect ratio of 4098x2304.