Macintosh Restart
When I hit the Restart button or select 'Restart' in the 'Special' Menu, in macintosh plus emulation, all I get is a black screen. Is this not supported?
It actually seems to work fine for me, so something must be amiss. I'll try more combinations of system, booting from disk rather than hard drive, etc.

I have: Mac OS 10.13.6 Clock Signal 03/07/2020
It will hang sometime when I close the window and I have to force quit. Also sometimes when enter fullscreen mode. Attaching diagnostic reports. Archive.zip
Fantastic, thanks for those. I clearly have a race condition in shutdown. Crashes are always top priority, naturally, so I'll look at this as soon as I get a chance.
Attached is an attempt to resolve the crashing issue. Everything else is unsolved. Clock Signal macOS 2020-03-11.zip
I'll give it a try, thanks!
Still experiencing crashes when I enter/leave fullscreen. Another strange behavior occurs when I insert (cmd-shift O) a disk: double clicking stops working. To get it working again I have to hit cmd-ctrl and click on the window again. Archive.zip
The windowed state seems to be more stable, if that helps you zero in on the issue.
Another build is attached; it aims to fix the crashing issues, at least. Clock Signal macOS 2020-03-20.zip