Turning off the hide dock in System settings made no difference; it remains hidden and takes multiple efforts to get it to reappear; just checked and it's much worse in Chrome but in Safari it also wasn't fixed so unless there is some setting I'm unaware of it looks like it's a Sonoma issue.
If it works in the new account but not in yours give this a try in your account: boot into Safe Mode according to How to use safe mode on your Mac and test to see if the problem persists. Reboot normally and test again.
NOTE 1: Safe Mode boot can take up to 3 - 5 minutes as it's doing the following;
• Verifies your startup disk and attempts to repair directory issues, if needed
• Loads only required kernel extensions (prevents 3rd party kernel/extensions from loading)
• Prevents Startup Items and Login Items from opening automatically
• Disables user-installed fonts
• Deletes font caches, kernel cache, and other system cache files
NOTE 2: if you have a wireless keyboard with rechargeable batteries connect it with its charging cable before booting into Safe Mode. This makes it act as a wired keyboard as will insure a successful boot into Safe Mode.
If it works in the new account but not in yours give this a try in your account: boot into Safe Mode according to How to use safe mode on your Mac and test to see if the problem persists. Reboot normally and test again.
NOTE 1: Safe Mode boot can take up to 3 - 5 minutes as it's doing the following;
• Verifies your startup disk and attempts to repair directory issues, if needed
• Loads only required kernel extensions (prevents 3rd party kernel/extensions from loading)
• Prevents Startup Items and Login Items from opening automatically
• Disables user-installed fonts
• Deletes font caches, kernel cache, and other system cache files
NOTE 2: if you have a wireless keyboard with rechargeable batteries connect it with its charging cable before booting into Safe Mode. This makes it act as a wired keyboard as will insure a successful boot into Safe Mode.
Since the problem didn't occur in the new account you may have some software installed in your account that's causing the problem. Therefore download and run Etrecheck.
Copy the report
and use the Additional Text button to paste the report in your reply.
Then we can examine the report and see if we can determine the cause of the problem.
To find out if it's system wide or user specific, try this...
Open System Settings>Users & Groups, unlock the lock, click on the little plus icon, make a new admin account, log out & into the new account.
Does it work in the new account?
In Safe mode it was worse; also noticed that "Hot Corners" had some that worked and others not. I tried a new account and all seemed normal; back in the usual account also except that while "Hide dock" is disabled it nonetheless disappears in Chrome and Safari but stays on the Desktop; at least it reappears rapidly once the cursor goes below the screen.
I can't recall what I altered while in Safe Mode; maybe a few possibly relevant things but in there usually the cursor disappeared after being moved below the screen and then back. The Dock took around five seconds to appear - if at all - and only left clicking on the mouse reproduced the cursor. This looks to me like some kind of intermittent interference although as it was worst in Safe Mode - it suggests that Safe mode is where the problem is most manifest; I can't make sense of that. For the time being all is well enough but there is an apprehension that some instability is just a click away on some unknown App or whatever.
All seems well with the normal account except that the Dock hides while in a browser; despite the contrary setting, but since it now comes up quickly I'm not concerned unless there is further deterioration; I did go into safe mode again earlier and the Mouse cursor was often uncontrollable; which seems odd; from my limited knowledge it looks like some App or extension is fixing an error in the OS; I'll do nothing for a while; maybe check Safe mode in the new account and keep Etrecheck in reserve for the time being.
The Dock suddenly took a few attempts or a few seconds to appear and it gets worse.
