I have a MacBook Pro (Retina, 15-inch, Late 2013)
2.3GHz quad-core Intel Core i7 processor
16GB of 1600MHz DDR3L onboard memory
Intel Iris Pro Graphics
NVIDIA GeForce GT 750M with 2GB of GDDR5
While testing early in the night, I noticed that some (and only some) videos would not show a picture at all - just blacked out.
These vids have been fine w the last ME version.
They show up on my 2009 iMac perfectly.
I can set up a dropbox so you can test them & let me know if it's something w my graphics card & changes I may need to make.