I had problems with NFL Mobile on my 9850 after I upgraded to 7.1...the app would open, but trying to load the scoreboard and some other screens would just result in a continually spinning cursor.
By chance, I opened NFL Mobile just now and it prompted me to upgrade (from 2.0.100 to 5.6.0 - I don't know how they come up with these version numbers). After a couple of minutes playing with it, it seems the problems I had since upgrading to OS 7.1 have been fixed.
It works again! Very excited - 1st - its good to have all the videos and score stuff running and 2 (and maybe more importantly) - this is a verizon app that today is now compatible with a 7.1 OS, hopefully this points to what I've been told that a VZW release of 7.1 is imminent.