Finally, I got it working. After days of trying everything I could think off, it turns out the "LG Connect Apps" setting in the tv menu was in the "OFF" position. However, the greek translation of the menu implied the opposite. Essentially, when "LG Connect Apps" is "ON" the greek translation is equivalent to "ACTIVATE" instead of "ACTIVATED". So when i thought I was enabling it, in fact I was disabling it. So the app works, but the greek translation of the TV menu is problematic. Off to file a bug report...