Monitor goes off for a sec when scrolling through images AND videos in full screen

[Litr]

Hello, i have a weird problem when my monitor goes off (black screen) for a sec when scrolling through images AND videos in full screen mode.
I am not saying it is related to XnView MP because it can be Nvidia drivers or bugged HDR mode on my monitor or even codecs or my "outdated" Windows 10, but here we are...

1) prerequisite: regular non HDR images and videos (i tried MP4/h264 or WEBM) mixed in one folder, Nvidia GeForce RTX 40 series GPU, 144 Hz HDR monitor with FreeSync/VRR and with HDR mode off in Windows settings (if its even matter, just saying)
2) launch XnView MP by opening image
3) switch XnView MP into full screen mode (i use middle click to do so)
4) start scrolling from image and go on the first video
5) monitor goes off (black screen) for a sec while the video is already playing as i can hear sounds
6) after that monitor will also go off for a sec when you exit full screen mode even on your regular images, so it is kind of stuck in some weird state.

I think it might be related to the refresh rate or FreeSync...

I am the only one with this problem?

[xnview]

strange i can't reproduce...

[user0]

I have similar black blinking (sometimes hanging for a few sec) from time to time, but without xnview . It started ~3-4 weeks ago
For me it happens when I watch video in chrome (in popup mode) + a lot of open tabs.
I suspect PowerToys FancyZones being involved somehow in my case.

i5 7600k, 16Gb with win11 (freshly install few month ago) and no video card at all

[Litr]

strange i can't reproduce...

I tested it a bit more and it does not happen if i switch monitor to 60 Hz or 98 Hz but does happen in 120 Hz or 144 Hz.

Also i have looked at my monitor menu (this menu can show the current refresh rate, but not in real time so i need to re-call this menu to update stats) after switching into this mode and it looks like monitors refresh rate can go down to some weird values like 56-55-58-64-55-66 Hz while still playing one video.

I am not an expert but it looks like VRR (variable refresh rate) mode to me. I am not sure why it is activated in full screen mode like this but maybe it can be related to some 3D or hardware video acceleration in XnView MP codecs or UI?