Actually I can't even pin point the date Look Back was added here. All I know is one day a few weeks ago I noticed the usual 'Press Select to Start Over' was replaced with 'Press Select for Enhanced TV' and that's when I noticed it. There have been no problems to speak of recently and, aside from two times, that were my fault, I have not had any signal issues with TW period since I've been back with them.
Maybe something happened to your signal that just happen to coincide with the launch of Look Back in your area. I would call them up and have them do a truck roll to make sure all your levels are good. Do you have internet or phone service with them as well, and if so do you have any issues with those?
Not that it would matter since you’re in NEO, a few hundred miles away from my cable headend in Rochester, but I DVR Dexter, but not live as I have too many other things going on, I record it Wednesdays on Showtime Too HD, so I can’t comment on Dexter last night.