It seems this is a common problem, I've found five similar posts so far. I've recorded the problem too.
My TV only does 480i so I had to plug it in to an analog video cable to set it to 480i to get the component output to work. I did the update and now when ever I try to access YouTube or NetFlix the 480i setting seems to change. When I go into the setup menu it still says 480i but if i change it to something else than back to 480i again everything works. Problem is every time it happens I have to unplug something else to plug in with the analog cable to fix it.
I have read that this is caused by the update in some other posts. I will probably take this one back to Walmart and just see if everything works corectly without the update as others have found. Seems like Samsung would solve this problem or their going to have a lot of returned units.

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic