I can no longer set a new app - or an app that used to be set for ‘All spaces’ but isn’t any more - to ‘All spaces’.
I have a number of apps that have been set for All spaces since I got this machine nearly 2y ago, and they’re (mostly) fine, but one - Safari - USED to be set that way but (obviously) no longer is, and nothing I do can set it back. ‘All spaces’ still appears in the pull-down, and can be chosen, but then it isn’t selected.
In trying to figure this out, I’ve also discovered that I can no longer set ANY app as All spaces, and that deleting and re-adding an app doesn’t help.
Anyone have any ideas?