After upgrading a 2016 iMac 21.5" i5 machine from Catalina to Big Sur,
an interesting problem has reared its quite ugly head. When a Kensington
Expert Mouse trackball is connected via Bluetooth and the system is shut
down in the normal way, it goes almost all the way down to black, then
an error window appears which says something went wrong, there's a long
long report displayed, and a couple buttons which can send said report
to Apple or not. Apple recommended a re-install of Big Sur, which I did
yesterday. The problem seemed to go away, but it's back today. When I
changed from using the trackball back to using the standard USB wired
mouse, the problem doesn't happen. I have a third option--the Kensington
Expert Mouse can connect not only to Bluetooth, but also to one of those
Logitech wireless receivers that work on the same principle as Bluetooth
but are technically not Bluetooth. I'm going to try this next and report
back. Has anyone had or heard of a problem with a Bluetooth pointing
device on Big Sur?
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