Bear in mind that the season is just about over but if the problem persists for other sports programming or for next year's 2014 NFL season, this is what I did. My problem was that all NFL AFC games broadcast by my local CBS affiliate in Washington, DC, had the problem. The audio was in Spanish even though my Second Audio Program function (SAP) was set to "English". Not only that, I lost all audio for local broadcast programming from my local Washingron, DC ABC affiliate. Instead of English audio, I received an annoying and constant beeping tone. My problem was only on the HD CBS and HD ABC affiliates and did not affect either of the SD broadcasts, whatsoever.
I believe that the problem started with the introduction of IMG 1.9.4. Verizon downloaded 1.9.4 with the DVS (Descriptive Video Services) turned "ON" instead of "OFF".
Do the following: Push the "Menu" button. Select "Settings". Select "Accessibility". Select "DVS". Select "OFF" to disable "DVS".
Hopefully, this will solve your problem. It worked for me.