If you are experiencing hangs with System Preferences/Hazel on Catalina, and are willing to help diagnose the issue, please help. I am trying to work with Apple to track down the issue but there seems to be a lack of info.
First off, if you can replicate it on demand, please post here with the steps taken.
In addition:
1. Reproduce the problem or wait for the problem to happen again. If an error message appears, leave the error dialog on screen.
2. Capture a screenshot. (The timestamp will show us where in the logs in to look.)
3. As soon as you see the problem happening, hit Shift-Cmd-Ctrl-Opt-period to trigger the sysdiagnose. The screen should flash to indicate it has started.
4. When it is done, Finder will open a window to the location of the log file in /var/tmp/. Attach that file back to us, as well as the screenshot that you took.
Please also capture a System Profile information report from About This Mac and attach that back as well.
Note that I will be forwarding this info to Apple so please keep that in mind.