MSFS unresponsive on a 2 Monitor system

[lc4c]

Long ago i posted this bug report:

Dual Monitor System with mouse and keyboard misbehaviors

Thank you using the Bug section, using templates provided will greatly help the team reproducing the issue and ease the process of fixing it. Are you using Developer Mode or made changes in it? no Brief description of the issue: I´m using a dual Monitor system. One screen for MSFS the other one for e.g. Simbrief, Navigraph etc. When using the mouse outside MSFS (second screen) i can go back to the MSFS monitor but with no use of it in the simulator. Keyboard and Controller is also …

It seems to be solved after SU 12 together with nvidia driver updates.
But since 2 weeks right after the SU14 update this bug appears again.

System: Win 11, i7 12700K, RTX 4080, DX 12 FG on, Main Monitor:2K Monitor 144 Hz Gsync off, Additional Monitor 1600x1200 Monitor 60Hz.

After using an application on the 2. Monitor i can not activate MSFS on the main monitor with a left mouse click nor can i switch to a windowed MSFS with Alt + Enter. MSFS has to be stopped using the taskmanager.

I appreciate any comments

[PHSepp796]

Select the sim with alt+tab to select or is this not working either.

[lc4c]

No response using Alt +Tab

[PHSepp796]

Check your screen settings in videocard control center and see if screen setup changed.
If changed try to set all to 1 screen and add the other one later.
If not changed you can try the next option
In usercfg.opt
There are lines fullscreen = 1
And windowed mode = 0
Change this to fullscreen = 0
And windowed mode = 1
Now the sim should start in windowed mode
If use after this in the sim alt + enter you switch to fullscreen and when leave the sim itt should be saved in usercfg.opt like before

[lc4c]

Thanks for your hint. I will be back at home tomorrow and give it a try.