System.log error after latest Security Update 2020-005 for Mojave from Sep 24th 2020

Don't mean to bother you, but do you know if the updates are safe? I've been holding off but now Apple wants to install them. I haven't yet.

Yes they're safe now, I installed them myself yesterday after waiting a week to see if there were any reports of problems.

I usually don't have any problems with security updates, but last night was a nightmare after I ran it on my Mac Mini(2014) running Mojave. My computer was so slow to the point of unresponsiveness for all command and key inputs. After several attempts of restart and power on/off cycling, I thought that a rogue or malware update broke my computer. I ended up running a MacOS reboot from Time Machine and thankfully my computer was back to normal after the procedure. Apple should stop pushing this update to users and get it sorted out. I am still getting the security update notification as of this morning, and I just unchecked it and will ignore it from this point forward.

Something is seriously wrong with the 2020-05 update. Installed on a 2015 Macbook Pro and it spun for an hour trying to shut down prior to install. I had to force shutdown. On startup, the install completed, and it appeared all was well. Then I wake it up a couple hours later and the fans are going nuts, Kernel task is using 600%+ and I can't fix it.

Restart, SMC reset, pram reset, Booting from another drive, booting from USB Mojave installer, wiping SSD and booting from either Mojave installer, or internet recovery.... all of them machine is slow as **** and fans are going nuts.

Since installing the update system log is being spammed with messages of the form "Class <name> is implemented in both <path1> and <path2>. One of the two will be used. Which one is undefined."

I get the same message when running some command line utilities. E.g.

$ softwareupdate --history

objc[1435]: Class AMSupportURLConnectionDelegate is implemented in both /System/Library/PrivateFrameworks/EmbeddedOSInstall.framework/Versions/A/EmbeddedOSInstall (0x115e39c58) and /System/Library/PrivateFrameworks/OSPersonalization.framework/Versions/A/OSPersonalization (0x115c9c358). One of the two will be used. Which one is undefined.

Something definitely isn't right with this update.

Agree with everyone else. Apple better take note. Hubs iMac (2.8ghz i5 - late 2015) has zero of anything installed, third party or otherwise. Literally web surfs and watches YouTube on it. He had automatic updates on and the install of this security update tanked the system. I too restored from a backup (AND TURNED OFF UPDATES) what a horrible release.

Add my machine to the list. Mojave has slowed my system down so bad that even the spinning beach ball takes time to show up.

Did I say it's now incredibly slow... as in sssssssssssssssssssssssssssssssssslllllllllllllllllllllllllllllllllllllllllooooooooooooooooooooooowwwwwwwwwwwwwwwww?

Mac Pro mid 2010 running macOS 10.14.6 (18G6032).

Thank you for the security update.. the machine is real secure now... no one would be able to do anything with it.

I installed the update a few days ago and, after a few days of hair-pulling, I finally took the advice I read from another member and just downloaded Mojave 10.14.6 and re-installed. All my files and apps were still there and it's working as it did before the update. Whew! A few lost days....

I guess now, I should just reinstall updates since Mojave was issued but NOT September update? Anyone know? I don't want to accept updates and have it just squeeze in the door with the others.

I suggest;

1. System Preferences -> Software Update, turn off "Automatically keep my Mac up to date" at least until they fix this mess

2. Download and install the previous Security Update 2020-004 from https://support.apple.com/kb/DL2045

3. Then go to System Preferences -> Software Update -> More info... -> if there is anything there apart from Security Update 2020-005 then install that

Due to it's Size my guess would be no, I'd start over...

Try reinstalling this in Safe Mode, but not using Firefox...

https://itunes.apple.com/us/app/macos-mojave/id1398502828?mt=12

Safe Boot, (holding Shift key down at startup).

Typing tmutil into the terminal does the same. Doesn't make be very confident about doing anything time machine related.

I used recovery mode and selected the day before 'snapshot' on the HD. Did not do a fresh install. I did run disk utility as well after and the HD is fine.

Probably because the more recent update is in place, cannot install this older version.

Helpful comments. Peace restored after reinstalling Mojave 14 plus Security update 004. However, Catalina not really an option for Mac Pro 2012 (I've looked at DOS-Dudes but am very cautious).