Glad it's working, sorry you lost calibration. I'm overall impressed by the LG system. But it's a "computer" through and through, including system crashes. It's also really complex and unintuitive, with three or four major sub-screens for user control and a menu-settings system that's...
I’ve got an LG LCD, and I’ve found it behaves like a computer, in that I’ve seen it crash in the middle of an update. But I’ve not had it behave like you describe.
if all else fails, I would try to Reset to Initial Settings. Maybe a factory reset will restore the apps, or let you download them...