I just bought my B6 last Friday and one of the problems that has surfaced has been the same as yours. When I try to launch LG's Netflix or Amazon or seems like any app, it takes me to I a search screen from a couple days ago and every time I try to get rid of the search screen, the TV takes me back to my starting point before launching any app, an infinite circle!
I do use a Tivo mini along with a wired internet. So I tried rebooting my Tivo mini, and that cleared the problem. But it takes Tivo several minutes to reboot, this problem could get old real quick. If the problem keeps happening I will have no choice but to return the TV to Best Buy.
Do you use any media servers like Tivo with your B6?