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I assumed you were using a mobile device -- a phone or tablet. So you're using the Sonos Desktop Controller on the PC. Okay, what operating system is the PC running? And if you go to Help/About My Sonos System, what version numbers do you see for the controller itself and for the players?
(By the way I suggest you remove your email from your last post. It could be scraped and used to send you spam.)
James - I'd remove your e-mail address if I were you.
You can attach pictures to the forum and much better than doing it offline - after all others may well have the same issue so if you take it via mail nobody can see the resolution.
Go into the Sonos app(program) on your desktop and under Help (I think) select "About Sonos" and check the version and make sure it is the same for the app on your desktop and all the speakers.
If they are different (Not all 6.4.x) then you need to update.
What OS are you running?
Arc + Sub (Gen 1) + 2 x Play 1/ Stereo Play 3s/ Era 100 Stereo in Kitchen, One Stereo in Bedroom, Play 1 stereo pair in Study, Play 1in Bathroom, Sonos Move 2
Arc + Sub (Gen 1) + 2 x Play 1/ Stereo Play 3s/ Era 100 Stereo in Kitchen, One Stereo in Bedroom, Play 1 stereo pair in Study, Play 1in Bathroom, Sonos Move 2
one controller is version 6.4
all the other connect Amps say 6.4.2
when i press online update it says i am updated
i dont know where to find the operating system on the PC... sorry !