Hey I saw lines too but it seems they have fixed it. However, here is something interesting. I am watching YES now and they were showing highlights of the Phillies-Cardinals game (I believe that is what was on channel 647) The highlights had lines also. ....Maybe this means that it actually wasn't a Directv problem but a problem with the actual Fox feed.
Also, I noticed that the Yankees highlights from Monday were washed out on ESPN. The signal was washed out on Monday's game on the YES feed and I assumed it was another Directv problem. However since the highlights were washed out on another network it must have been the Yes feed.
It looks like all of these networks are having to work out several kinks.