OBS Projector causes flashing + freeze when sending to Elgato 4K60 Pro MK.2 (RTX 5090)

[CookiestMonster]

Specs:
OBS 32.2.1
GPU: RTX 5090 (latest drivers + tried older ones)
CPU: Intel Core Ultra 9 285K
Windows 11 25H2 (Build 26200)
Main monitor: Samsung Odyssey G81SF 4K
Capture card: Elgato 4K60 Pro MK.2 (used as extended display)
Problem: When I open any Fullscreen or Windowed Projector (Source) to the 4K60 Pro MK.2, OBS starts flashing black and then freezes. After it freezes I can’t even change sources properly.
Happens with Display Capture and Game Capture
And even with a simple Colour Source
Same resolution and refresh rate on both displays (tested at 60 Hz)
Clean OBS install, deleted all settings, new profile/scene collection
Already tried:
HAGS disabled
Running as admin
Multiple driver versions (clean installs with DDU)
Force Hide OBS windows
Turn off Game Bar / Game DVR completely
DXGI, cursor off
No useful errors in Event Viewer.
log
https://obsproject.com/logs/IcwEtam09klsnvAG

 

[prgmitchell]

the video makes it look like your GPU driver may be crashing but the log you provided doesn't seem like a log that would've actually captured any error, it only shows an OBS session that was open for 2 seconds. you'd want to reproduce the issue and THEN grab a log to send here.

 

[CookiestMonster]

the video makes it look like your GPU driver may be crashing but the log you provided doesn't seem like a log that would've actually captured any error, it only shows an OBS session that was open for 2 seconds. you'd want to reproduce the issue and THEN grab a log to send here.

the log for some reason doesnt show any of these problems at all I've recreated the log a few times and it still the same that there is no projection log or when obs freezes and when the drivers freezes there is just no log for it
I've tried both 596.49 and 610.88 drivers both the same issue

 

[prgmitchell]

OK but the log is for me to look at and decide if I see anything, unfortunately taking your word for it is not an option. You'll need to reproduce the issue and then send a log, the log you sent was grabbed 2 seconds after OBS was opened.