HUGE Artefacts when playing 24p doesn't happen in VLC

Hey Everyone,

I was looking through the forums and found some fixes like "change to aero theme" and what not but I couldnt find a fix.
I hope you can help.

So, my setup is as follows:

XBMC + HD Audio RC2 (I tried installing the finale but constantly get an appcrash when launching the program... another issue I'm trying to resolve)
i3 2105
ASRock H77 Pro-4-M
4GB 1600 RAM
120GB SSD
Windows 7 Ultimate
Onkyo TX-SR606
Sony KDL-52XBR4

Yesterday my buddy came over and I was about to show off my new HTPC with some game of thrones (which he hasn't seen... I know, CRAZY!!!) when all of the sudden, I press play and the video has all sorts of artefacts on it when things are moving on screen. We then tried VLC, and the video was flawless. The Game of Thrones episode is 8GB 1080P 24Hz.

I tried a couple of playback settings but it didn't work. maybe I'm missing something.
If there is no fix, is there a way of disabling the 24p. And, why does VLC work and XBMC doesn't.... that's really weird to me.

Anyway, any help would be greatly appreciated.