I can help you by remote
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Restart your Mac
As soon as you hear the Startup chime, press and hold the SHIFT key
Continue to hold the Shift key until you see the Apple logo and progress indicator.
Then, let go of the Shift key and let it boot to the Desktop (it may take longer than usual so please be patient).
See if the issue still exists.
Restart and test again, then let me know.
did it not work either time?
Can you please download and run the following tool?
It will collect information about your system for diagnostic purposes.
Run the app once it has downloaded
On the first screen, leave all options checked and click “Start EtreCheck”.
When it is finished collecting data, click “Share Report” and choose "Copy report to clipboard"
Then click “I Accept” and paste it back to me as a reply. (You should be able to paste it back by right-clicking or Ctrl-clicking where you type your reply to me and then choosing Paste from the pop-up menu).
are you able to drag if using three fingers to drag without holding down the button?
1. Click on System Preferences.
2. Click on Accessibility.
3. Click on Mouse & Trackpad.
4. Click on Trackpad Options.
5. If "Enable Dragging" is selected, click on "Three Finger Drag" in the dropdown menu.
Great, glad to hear it was resolved.
This seems to be a semi-rare oddity for some users where a few settings get reset during upgrade. :-/
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