Hello D.I.
Thank you for the hint on EtreCheck. I did run this.
It points to some issues, but mainly things I am quite familiar with, like a local proxy (Little Snitch), several System Extensions, like all the Adobe and Microsoft stuff und several tools, printers, online meeting software, VPN settings, orphan files, unsigned software and stuff.
But hey, this is no clean system.
Before you ask - I disabled a few things like Little Snitch to "debug" the issue, made a clean start...
But this made no difference.
The 3rd party software configuration on my Mac has not been changed for a while. With the earlier version of Music I do not notice this particular issue. So if there might be a cause in the software setup, the recent new version of Music got an issue, this has changed, not the ecosystem it is running in.
I'm sorry, I can not upload the report because of the big thumbprint it takes of my system and all the details listed.
As I took a closer look to the report I also must say that I will and can not revert most of the software setup to a clean system. This Mac is no standalone mp3-player. There is no explicit note in the report to issues on Music. 2 crashes were logged, but that was me, validating an older version (yeah, it does not work!)
Anyhow, after a few more checks I validated a different issue for a different person, who got problems with the Apple Music Radio.
I got an interesting point...
If I toggle the "Apple Musik" option in the preferences to "On" (to get the Apple Music Radio running), the empty screen is gone and shows me the last view I left Music, a playlist (not the Radio)!
Well - Question:
Is an "Apple Music" abonnement crucial for a proper function of the latest version?
This might make sense because the start up may check if some online offering should be shown to me and can not be addressed because it's simply deactivated. But this must be an accepted case in my opinion. Did the developers think about the case people were not online? Without a payed abonnement?
I don't have an "Apple Music" abonnement, and I will not. That's why it was and will be disabled to avoid the red advertising banner on the top.
So I disabled it again after testing. I will update this thread as soon I see an empty screen again.