hairy_hen said:The 2.1 channel format I used is unusual and apparently doesn't play nicely with some setups...
From Dolby's encoding guidelines:
Use of the LFE channel is optional with multichannel programs, but is not
available for mono, stereo, or surround-encoded programs.
This is probably why 2.1 is proving to be problematic. To be honest, I'm surprised your encoder didn't throw up a warning when you selected this channel configuration.