Just checking you’re following the right procedure to play and group your speakers (sorry if obvious already)...:

To play music on a specific speaker/room:

Home screen - touch the name of your system top left (or drag up the Now Playing shape from the bottom). This brings up all of your available speakers. 

Tap a speaker you wish to play music on. This then becomes the active speaker.

Select music to play. It will play on this speaker.

To play on multiple speakers simultaneously:

On the Now Playing screen (or on the Now Playing section at the bottom of the screen), tap the icon that shows two speakers in front of one another. This brings up the grouping screen. 

Tick/check each speaker you wish to group. Tap Apply.

Any music you select will then be played on these grouped speakers. 

(Untick/uncheck the speakers again to remove them from the synchronised group.)

Yep, doing that. But when I click ‘apply’ it goes back to the previous setting. So my speakers are called ‘Den’  (Sonos One) ‘Family Room’ (Beam) and ‘Kitchen’ (Sonos Play). All have been updated.  On opening the app it defaults to “Family Room’. if I try to add the others, they show as done but when I click ‘apply’ it reverts to ‘Family Room’. If I de-select that one and apply another, it does the same. Through sheer persistence ( a lot!) I can sometimes get two playing or switch between three. But even then, if the ‘Den’ is playing alone, it can still show up as ‘Family Room’.

Same issue

My network provider is Virgin - not that it affected the old app. Is yours different?

Just tried it again - working normally!  Did someone do something?????? Lets hope it lasts.

I have an old system, added a Move today... 

Disconnected everything! Set the complete System up again... no Updates work 🥵

Since the new App, its awful!