Can't Import MP4 into Toon Boom Studio

Though it’s listed in the documentation, importing MP4’s does not apear to be supported.
Here is my experience:
http://screencast.com/t/g2JJwTMg

Any Thoughts?

Hmmm… same here, all mp4 movies are greyed out…?

Either, open those movies with QuickTime 7 and Save… / or Save As…
Or just replace .mp4 with .mov…