When they update the firmware apps have to be reloaded.
But you bring up an interesting area. You might be thinking the TV is like your PC with you having full control over apps and such.
Sorry, it's not like that yet!
I have bought Samsung smart led UA40D5500 from a month & i use the black youtube which installed in recommende section today i found that this application is de-installed automatically and when i enter samsung apps to re-download it i didn't find the same application but i found the white youtube logo which is unusable application because many bugs it have.
So why samsung de-install my application without notifying me & u don't have rights to uninstall my application also how in ur samsung apps website show that the installed youtube is the black one ??