When I hit Mute or Solo buttons in an Audio track, the “Deactive All Mute States” and “Deactive All Solo States” buttons get highlighted for a fraction of a second and the Audio track doesn’t get muted or soloed.
Do these issues appear on several projects or just one?
Do they manifest on a new, blank (not from a template) project?
Have you tried running Cubase in Safe Mode with preferences disabled?
I am afraid your issues come from corrupted preference files and the only solution might be to reset your prefs. I suggest to make backups of the Steinberg preference folder, just in case something like this happens. I backup mine all the time I change some setting in Cubase.
Its definitely a rare problem, but it still seems to happen (I fortunately never had this issue and I work over 7 years daily with Cubase now). My guess is that it happens while Cubase writes to the preference files and crashes at the same time, like corrupted system files when Windows crashes in the right moment.
Hey, I just wanted to mention, that I found this thread from a search because I had the same problem all of a sudden. When I read the solution of deleting preferences, I didn’t know how to go about that, but it did make a light bulb go on in my head. Everything was working fine yesterday, but this morning when I woke up and restarted my PC, I had this problem. I would click solo or mute, and they wouldn’t latch. Also, sometimes it made the buttons flicker really oddly.
Anyway, I saw this post, and then remembered I changed something in preferences on this project yesterday. All I did was Preferences>Editing and checked the box for "Automation Follows Events. That was yesterday. So I went back and unchecked it. Now everything works fine. I guess this is a bug in Cubase. I hope this helps someone.