I saw a thread on AVSForum earlier asking the same question. It sounded like 17-2 and 17-3 were working, as was the analog feed of 17 OTA... but some people noticed 17-1 OTA not working.
Checking myself just now... Dish SD feed appears to be working, HD has a "we know" slate... 17-2 is showing weather, instead of Universal Sports, 17-3 was a black screen, and 17-1 was center-cut as you noted.
I have not seen anything official on their Web site as to what happened. Maybe something glitched in preparing for Friday's cutover. I'll follow up if I learn anything.
If I had to make a guess - I'd say something broke on the HD encoder path and the station changed the PIDs so 17-1 is showing "something", and just let 17-3 show "black" until they can get it fixed.