Hi,
Here is my current system info:
Model: Samsung UN46ES6150
Software ver:1004.4
Smart Hub Ver:42511-5.0
Youtube app version: 1.041

Problem description:
1-Video/Audio out of sync:
Video will play properly for the first few min then suddenly the video will freeze and voice will keep playing, Then voice stops and video resume playing. Video and audio keep interchanging like that till the end of the clip which makes watching a video impossible on youtube.

2-Forward and reverse seek are not working.
if you reverse few sec or forward few sec, the stream will stop and freeze.