My movies don't work properly

Hello VLC-Player Team,

for a longer time I've been a satisfied user of your VLC-Player, but now I have a problem, that I can't handle and need your help:

I have 2 machines running the new VLC-player client, version 2.0. 
One is my PC with Windows 7, the other one is a new 2011 MacBook Pro with Corei7 and Mac OS X 10.7. 

Before, I had some other VLC-Player versions installed on my MacBook Pro. 
But since I can remember, I have these judders  on my external screen.. whose I couldn't fix until today.

Description:
When I connect my MacBook Pro via HDMI to my 40" LED TV (Samsung), to play BluRay movies (Full-HD) in MKV-format, 
I get these judders through the whole movie, that makes the movie almost "unwatchable"!

Is it possible to get these Full-HD movies in MKV running properly on my new MacBook Pro 2011?
On my WIndows 7 machine, I didn't have these problems since I can remember.

some movie-facts:
video codecl: VC-1 / H264
audio: DTS / DTS_HD / AC3
frame-rate: 23.976 Fps
resolution: 1920x1080 (FULL HD) 
data-size: 7,95GB (MKV-data, on the internal HDD)


I would be very pleased if you could help me soon.



Best Regards,

Remko Müller.
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