You can see the software version of your Roku devices under Settings->System->About. It's unlikely that they all updated at the same time since updates are usually rolled out over time, but they may or may not all have the same version. Have you tried another non-Roku HDMI device with the TV like a Blu-ray player or cable box? Trying another HDMI cable would also be something to try. Beyond that, you could try the various options under Settings->Audio to see if any have an effect.
Roku Community Streaming Expert
Help others find this answer and click "Accept as Solution."
If you appreciate my answer, maybe give me a Kudo.
I am not a Roku employee.
