I asked earlier in the forum what point there was for me to upgrade to MC23 since I use it exclusively for audio. I didn't get an answer but I went ahead and did so anyway. Boy, there are some issues.
First, here is my configuration: I have three Windows 10 machines and two Raspberry Pi boxes. Two of the Windows machines have the same files, but on local disc. Call me paranoid, I like lots of copies, and I don't want any wifi lag or drop outs when I'm playing audio through my reasonably high end music systems. The third Windows box is a laptop, and with that and the RPIs, I play over the network.
On my Raspberry Pi players the upgrade caused the access key to change. This required me to go to the gizmo and JRemote apps on my phone and tablet and re-enter that. On one of the Windows boxes, the libraries were all lost and had to be rebuilt. On the same box, every time I fire up MC23 I get the Windows message "Do you want to allow this app to make changes to your computer?" which is annoying as hell.
Something else...I had a library named "FLAC" and while it doesn't show up in the "Playing From" list, when I tried to re-create it, MC changed the name to FLAC (1) which indicates to me that it 'knows' about the other library somehow, even though I cannot see, access, rename, or delete it.
If you're contemplating upgrading, you may want to wait a bit until things settle down.
On the other hand if I'm missing something simple, please chime in.