Subtitles and Closed Captioning, as terms, are often used interchangably, but they can perform seperate functions. (Such as including background sounds, gunshots, door slams, etc rather than just the spoken words).
The player will play subtitles provided that subtitles are a feature on the disc. Surprisingly, this is up to the studio if they want to include subtitles, though most of the major releases do.
Each input is independent when it comes to settings. So, those changes may have done something that without knowing, I can't explain.
What I can say is that if you call DirecTV (or your applicable service provider), they can likely assist in getting those subtitles working. If not, the calibration technician may have to come back out and fix the issue if he changed something inside of the service menu.
I have a LN52A850 and have just added a BD-P1600. There's an HDMI connecting the two. I finally figured out today how to have CC working per page 36 of the BD-P1600 manual.
By going to menu, I scrolled down to Set Up, over and down to Language and Subtitle. Audio, Subtitle, Disc Menu and Menu are all set for English. It seemed to be working fine. Is this the right way to do it?
Best Buy was here later today to calibrate the LN52A850. Now I can't get CC or Subtitle to work. I orginally had my Directv receiver going to the HDMI 3 jack and the BP-P1600 going to HDMI 2. The only change I see is the guy from Best Buy moved the Directv receiver to HDMI 1.