I tried this a while back and nobody replied to it. The people that are having problems with Dolby Digital post here with your make and model and any other information (Like settings) that you might help. THis way maybe someone has it working with their system or Dish might catch this thread and it can help them in narrowing down the problem.
Known Problem Units
Sherwood Newcastle AVP-9080 preamp
Marantz SR4000
Technics SH-AC500D
Technics SA-DX950
RCA RT2400
Harman Kardon AVR55
Onkyo SR601 (Possible User Configuration Error)
Working but with some problems
Kenwood VR-3080
Pioneer VSX-1014 (there is a link to AVS Forum for more info)
Known Working Units
Yamaha RX-V800
Yamaha HTR5640
Yamaha rxv-1400
Yamaha RXV-3300
Yamaha RX-Z9
Pionee Elite VX-26TX
JVC 8030
JVC-6008V
ParaSound AVC-2500u
Sony STR-DB930
Sony STR-DA1000ES.
Sony STR-DE885
Sony DEH935
Sony DEH985
Denon 3805
Onkyo TX-DS989
Known Problem Units
Sherwood Newcastle AVP-9080 preamp
Marantz SR4000
Technics SH-AC500D
Technics SA-DX950
RCA RT2400
Harman Kardon AVR55
Onkyo SR601 (Possible User Configuration Error)
Working but with some problems
Kenwood VR-3080
Pioneer VSX-1014 (there is a link to AVS Forum for more info)
Known Working Units
Yamaha RX-V800
Yamaha HTR5640
Yamaha rxv-1400
Yamaha RXV-3300
Yamaha RX-Z9
Pionee Elite VX-26TX
JVC 8030
JVC-6008V
ParaSound AVC-2500u
Sony STR-DB930
Sony STR-DA1000ES.
Sony STR-DE885
Sony DEH935
Sony DEH985
Denon 3805
Onkyo TX-DS989