Bob - I just caused total mayhem in MC while testing a New Version of my TrackInfo Plugin:-
I used the Detach Display Panel Option which gave me FullScreen Detached DP as the only window/screen.
But when I tried the Reattach Option MC, and/or the OS, went biserk:-
Instead of getting a single window, the one that I had used the Detach option on, I ended up with 2 Windows, the Detached Panel Window and the one I expected to see after the panel had been reattached. With Mc or the OS rapidly switching between the 2 windows, I finally got it to stop jumping between the 2 windows by clicking on one of them.
Thankfully I had clicked on the window that should have been the one the panel had been reattached to but although the Cover Art was showing in the display panel in the Tree it was telling me the "Window was owned by another view". I Then tried using the Skins Clloe Button to quit MC but it didn't work, nor dd clicking on the other buttons or the Menu work.
So I ended up having to use the Dock Quit Option to close MC Down.
On restating MC an Apple Error Form Popped up - with this report:-
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Translated Report (Full Report Below)
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Process: Media Center 31 [2017]
Path: /Applications/Media Center 31.app/Contents/MacOS/Media Center 31
Identifier: com.jriver.MediaCenter31
Version: 31.0.48 (5985)
Code Type: ARM-64 (Native)
Parent Process: launchd [1]
User ID: 501
Date/Time: 2023-09-04 09:36:03.7744 +0100
OS Version: macOS 13.5.1 (22G90)
Report Version: 12
Anonymous UUID: 40BAA9A7-2206-1F5B-EDF2-E787683EF53A
Time Awake Since Boot: 810 seconds
System Integrity Protection: enabled
Crashed Thread: 0 Dispatch queue: com.apple.main-thread
Exception Type: EXC_BAD_ACCESS (SIGSEGV)
Exception Codes: KERN_INVALID_ADDRESS at 0x000020a800000000
Exception Codes: 0x0000000000000001, 0x000020a800000000