I had to take the TV to service. They say that they did a re-soft. _However_, I have a feeling that the problem I had may be related to network firewalls.
You see, I had the problem with the brand new TV that I unboxed at my workplace (where there may be some tcp filtering going on). However, after service, I took it _home_. So I would know.
Once home, the supposedly fixed TV had an even more serios problem: LG content store would just show a blank black screen. But the Browser worked, just as it was working back at workplace, where it had the original error.
This time it was because of spotty wi-fi signal. I solved it temporarily with a wi-fi repeater, an then found a way to stick an ethernet cable into it.
And now everything works.
HTH