Since 11.5 I am unable to adjust the volume of the rear surround sound speakers.
@Dwjenks
Thanks for the post.
Can you please provide more detailed information about the issue you are experiencing? Is your Roku Wireless Speakers paired to your Roku Streambar or to a Roku TV? In addition, can you provide the Roku Streambar model, serial number, device ID, and software OS/version (these can all be found in Settings > System > About)?
With more detailed information, we will be able to investigate the issue further.
Thanks,
Danny