KDE flashes up 2 times them the screen just has the mouse pointer & the app that autostarts?

Well prob. other DEs too, but boota up, KDE starts, then it disappears, comes back & goes again only the mouse with the program that autostarts open. The mouse moves, I can drag the window, but no right click. Presh the windows key & nothing. Rhe 275 nvidia drivers were in the updates, could they be it/?

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I have similar problem. After loading I have only black screen with cursor

Your topic is next to impossible to understand.

Even Manjaro team does what they can to avoid issues with stable branch - it is impossible to guarantee.

Personally - as a long time user and member of the team - I have no issues using the bleeding edge (unstable) branch.

My system as seen from the Plasma Settings → About this System

Operating System: Manjaro Linux 
KDE Plasma Version: 6.4.3
KDE Frameworks Version: 6.16.0
Qt Version: 6.9.1
Kernel Version: 6.12.39-1-MANJARO (64-bit)
Graphics Platform: Wayland
Processors: 24 × AMD Ryzen Threadripper PRO 5945WX 12-Cores
Memory: 64 GiB of RAM (62,6 GiB usable)
Graphics Processor: AMD Radeon RX 7900 XTX
Manufacturer: LENOVO
Product Name: 30E000GMMT
System Version: ThinkStation P620

and using 6.15

Operating System: Manjaro Linux 
KDE Plasma Version: 6.4.3
KDE Frameworks Version: 6.16.0
Qt Version: 6.9.1
Kernel Version: 6.15.7-1-MANJARO (64-bit)
Graphics Platform: Wayland
Processors: 24 × AMD Ryzen Threadripper PRO 5945WX 12-Cores
Memory: 64 GiB of RAM (62,6 GiB usable)
Graphics Processor: AMD Radeon RX 7900 XTX
Manufacturer: LENOVO
Product Name: 30E000GMMT
System Version: ThinkStation P620

I ran into same problem. I am new to Linux and don´t really know enough to troubleshoot it myself. I downgraded all KDE-related packages back to 6.15 to get my desktop back up and running. It is not a solution, but a temporary workaround. I will try to dig deeper into it when I got more time.

Sorry, could not post a log, I could do nothing. I tried all of my boot options in Grub all did the same. This is a new install, sadly no seperate /home so all new. This is the reg .iso from page not testing or unstable.

It’s most likely Nvidia-related (again).

Hmmm, Nvidia, got to love them. I have not updated since reinstall. A bit nervous to.