Even if I explicitly closed it before shutting down. Many users have reported Mac Bluetooth issues that cause connected devices to behave erratically.These problems resulted in my Wireless Keyboard, Magic Trackpad and Mouse not working correct fly (i.e., erratic cursor movement) and disconnecting frequently. In fact, as I recall, if I'm on the Catalina side, Firefox will come up without my explicitly launching it. When shutting down on the Catalina side (and this has been happening for about as long as the System Preferences lockup, again only on the Catalina side), Firefox will refuse to shut down unless forced. A symptom I failed to mention before, but which may be related Once Disk Utilities came up, it showed both "SanDisk SSD" and "SanDisk SSD - Data" I ran Disk First Aid on both of them. It was then that I realized that whatever was locking up System Preferences was also eating up lots of CPU time: performance was extremely sluggish just navigating to Disk Utilities. While it was doing that, I tried Disk First Aid. Select the hard drive you’d like to reinstall mac OS Catalina to and click Install. In the first window, select Reinstall macOS Continue. It asked for my password a second time, just before the desktop came up, and the secondary screen did not come up (thereby dumping a s-load of icons onto the main screen desktop).Īttempting to go to "security and privacy" in System Preferences still threw up a pinwheel mouse-pointer. The correct way to reinstall macOS Catalina is to use your Mac’s Recovery Mode: Restart your Mac and then hold down + R to activate Recovery Mode. I held the shift key while the switchover was in progress, up to the point where it asked for my password (both load-source drives, i.e., both the internal HDD and the external SSD, are encrypted), and then held it for quite a while after giving it my password. At least, I think it was a safe mode boot - it didn't say anything about safe mode, the way it does for recovery mode. In the file menu, go to Options and uncheck the option which says Auto-apply Post Install Patches. I finally found the time to try a "safe mode" boot on the Catalina side today. I've seen suggestions specific to other System Preferences panes hanging, under different macOS releases, but not specific to Catalina or to "Security & Privacy." ![]() Under Catalina, if I try to go to "Security & Privacy" in System Preferences, it hangs, and becomes unresponsive until I Force-Quit it. I'm in the process of migrating from Mojave (on the internal HDD) to Catalina (on an external SSD).
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