I just installed my Roku Ultra and its included voice remote (RC795).
The sound is only coming out of one side, i.e. I can only hear it in one of the two earbuds.
I have used the Roku3 for many years and never had this problem.
I have tested with several headphones first on the voice remote and then my mobile phone. They all work on my mobile phone in stereo but not on the voice remote.
Is this a hardware problem? If so I guess I am in trouble as I bought the Roku Ultra at Best Buy two weeks ago while on holiday in Florida, and now I am back home in Greece.