System settings > Display configuration > Compositor > uncheck ‘Allow applications to block compositing’. Additionally try to change the Rendering backend to OpenGL 3.1.
Seems to be fine on my side, on Manjaro Cinnamon.
Thanks for replying. latte-dock seems to leave no traces itself in the logs (checked the journal logs via the KSystemlog app that comes with KDE, as well as by running latte in the terminal), so I cannot say for sure where it is loading the widget from, but it has to be the one in /usr/share/plasma/ because I deleted the other version in ~. I tried adding the widget to the dock and changing settings or leaving the defaults before terminating the dock, in both cases it cannot start again. I have also tried creating a regular plasma panel and leaving the widget there, and that seems to work fine even after restarting plasmashell. So the problem is related to Latte.
@Jazz Latte works just fine in my case without the widget, and I don’t see how these compositor settings can help. I did try to change them just in case but there was no difference.
That makes some sense to me: something about using event calendar with Latte. I don’t use Latte hence no problems. Sorry I can’t offer a solution, I’m just tracking the thread before I update on Monday.
Will it update without any errors?
To be 100% sure everything will be alright, try to make your own backup/restore system and make a new backup every time right before each update:
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Smooth update on 7 (KDE) computers.
Thank you Manjaro team!
With this update, auto-login stopped working in Cinnamon 
I’ve got the same problem as you.
I have a temporary fix for now.
When you have the black background hold down Ctrl + Alt + F2.
Log in and put in your password.
Than type startx.
It should take you to your gui.
That’s just the temporary fix I don’t know how to fix it permanently yet.
I resolved my issue and described how did I do it here:
$ rm -rf ~/.local/share/plasma/plasmoids/org.kde.plasma.eventcalendar
After the Manjaro update, you may update eventcalendar plasmoid and restart Manjaro.
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I’m not running KDE so should I still remove the eventcalendar?
Not sure, but I’d say it worth a try to temporarily move it to another location then…
I checked to see if it is on my system.
Using the cat command to find the eventcalendar returned no such file or directory.
Then we don’t have the same issue.
No I thought we did because you had a black screen like me.
I hope to find a fix.
Thanks for your time.
I have three kernels installed, only the 5.8 show the “firmware xhci_pci” warning in the make log.
NO 5.8 kernel sees any wireless network to list. Although their setup information, including password are there. Intel 3168 wifi card. AsRock X470 Taichi board.
Kernels 5.4 and 5.7 work flawlessly.
Hi, I updated today, but with 5.8Kernel…
Update causes long waiting time (1 minute) for SDDM after startup.
After that monitorsettings are not saved.
Upower could not be started, journal is talking about USB-Ports, that are broken. Dolphin takes 30s to start (quiet similar to this https://fungos.github.io/dolphin-deep-dive/).
Rolling back to 5.7Kernel solved all this.
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Many thanks for the suggestion deleting eventcalendar from the plasmoids subdirectory worked for me too along with not using the arc-ICONS icon set which also caused plasmashell not to load
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After the update Kde plasmashell crashing
tried deleting the plasma and plasmashell folder but did not help.
I get these error in plasmashell :
/pastebin.ubuntu.com/p/DGzp7Jhzfc/
Hello, thank you for continuous updating the system. The update it selves ran smooth without any error. BUT the system is very slow in execution - especially running virtualbox feels like on a i386 in former days… 
Any suggestions for speeding up the machine to the level of Wednesday?
Thanks again. Keep up the brilliant system!