They pulled the game on directTV Sunday ticket and now two streams of PIT and NE. So pissed.
Too late for this game, but if it happens again, can find the original stream again by either switching to the 4-up layout with a Vikings game in it, then click on that if you want it full screen. Or if that doesn't work (or on a browser), view something else (i.e. Redzone, any other game), then go find the Vikings game and click on it. You should get an option of which version to watch, one of them will be the actual Vikings game, the other will be the broadcast feed. Might not work immediately (or may need to close/reopen YTTV).