Hey Lars, try playing this video back on your iPad now, it should work: https://vimeo.com/26052653
I'll review this bug with our developers and see if we can batch run the fix that I applied to that video.
Sorry for the late reply - I didn't get an email notification on the merged thread.
Do you want me to re-upload any files? I'd prefer if it could be fixed server-side so I won't have to re-upload loads of video files :-)