I have a Sony Blu-ray player and Sony receiver and all my blu-rays play properly except the dts track with all WB blu-rays. Is this a player or receiver (or both) problem? It plays them PCM 48.

Hard to know without more details. It's possible your player has a separate setting for how it handles DTS vs. Dolby, but usually on the players I've seen, it's either bitstream or decode for any audio type. If you decode at the player it will send PCM regardless. If you are set to bitstream, the receiver has to decode it. If your receiver isn't capable of decoding DTS-HD MA, that could be the problem.

You specified WB Blu-ray's with DTS. Are you saying things are OK with non-WB Blu-ray's which have DTS? I'm not sure if WB does their DTS tracks differently or not.

Yep,all the other blu-rays play dts properly.

Check your receiver manual to see if it says it can decode DTS-HD MA. If it can, set your player to bitstream and see how it does. If it can't do DTS-HD MA, you'll have to decode at the player. Make sure your firmware is up to date.

It played them before w/o problem. I must have hit the wrong button on the receiver and they won't play.

Weird because a Newline Cinema Blu-ray played dts and they are part on the WB Family.

Oh Ok that's a whole different thing then if they worked before. I bet you just hit a processing button on the receiver and that's why you're seeing PCM 48. Trying cycling listening modes until you find something like "Direct".

Yeah-I've been doing that with little success. The on screen display for the Blu-ray player shows that it is a dts track but the receiver says otherwise.

Can you please give us the model number of your receiver?

Sony STR DE 885. Guessing it's about 12 yrs old. Plays everything except WB dts Blu-ray tracks. I should find some WB dvds w dts/track too see if they play ok.

Yeah 12 year old receiver - that's the suspect for sure. Your only chance at getting lossless from those DTS-HD MA tracks (or Dolby TrueHD for that matter) is letting your player decode them and send them over as multi-channel PCM. If you were seeing DTS light up on the receiver before, it was likely just the DTS core.

EDIT: Now that I think about this more, you wouldn't even have HDMI on the receiver. So how do you have the player connected to the receiver? Optical? Coaxial? Analog cables? If you're using optical or coaxial, best you're going to get is the DTS core. The only way I know of to get lossless from a Blu-ray player to a receiver without HDMI or DTS-HD MA decoding is via 5.1 analog cables. Most newer Blu-ray players don't even include those analog outputs anymore though.

If you're happy with your Blu-ray player and it doesn't have analog outs, I would suggest getting yourself an inexpensive HDMI receiver. It will make things a lot easier.