Okay, first of all, I love this version and I really love what you did with the font choices, movement, formatting, and such!
Hmmm for the 4k issues... have you tried with other files? Is it just that file? The only times I've had issues like that it's been specific files that are somehow protected against 4k video downloader (especially things you need to pay for on youtube, but occasionally other things). Then I have to resort to getting it otherwise, buying it on itunes, or some such.
I could try to dl it for you and see if i get anywhere?