[BUG] OBS window flickers every 4 seconds

[Coincident]

Streaming on Twitch has been a nightmare for months now: the OBS main window keeps flickering approximately every 4 seconds.
Here's a recording of what I see: https://www.youtube.com/watch?v=ATAsbf3M7zY

This bug happens when:
- Capturing doom (source-port is dsda-doom)
- Streaming to Twitch
- Having the "Twitch Chat", "Twitch Stats", or "Twitch Activity Feed" docks open

I've tried all of these, and they did not fix the problem:
- Updating OBS (over 4 different versions)
- Updating NVidia drivers (over 3 different versions)
- Reinstalling the NVidia drivers with a "clean installation"
- Turning off the preview
- Changing the options on the Game Capture source
- Using Window Capture instead of Game Capture

Because *closing the Twitch Chat window fixes the problem*, I believe this is an OBS bug, and not a graphics driver incompatibility.
What else can I try?
What else can I provide to help fix this bug?

 

[PaiSand]

Test the quality of your upload connection using this app:

TwitchTest | r1ch.net

Test your upload bandwidth and connection quality to Twitch

r1ch.net

Anything below quality 90 it's bad.

Restart OBS and perform a test stream/recording of no less than 30 seconds doing as you normally do, including playing games, full camera or whatever you normally do.
Look in Help menu. Upload the current log file and paste the url to the log in here. Click on the Analize button to start troubleshooting common issues.

 

[Coincident]

This has nothing to do with the stream quality/upload connection. The quality is perfect every time I stream.
The problem has to do with OBS' desktop window, which flickers every 4 seconds (there's a video showing that in the OP).
This flickering is only visible on my windows desktop: people who watch my stream do not see any flickering.

Restarting OBS doesn't work. As I mentioned in the OP, this problem has been happening for months so I've restarted (and updated) OBS plenty of times.

Also, I forgot to mention: there's nothing in the logs when the flickering happens.

 

[PaiSand]

If the flicker isn't in the stream (OBS is working correctly) but only in your computer you need to check the video card, check the cable to the monitor, check the monitor. Same with the OS.
As mentioned in thousands of threads in the log file there's information that may give hints. It's up to you if you want help.

 

[Coincident]

OBS is NOT working correctly. I posted video proof on the original post of this thread showing exactly that.

-> If I open the OBS dock window for "Twitch Chat", the BUG starts happening.
-> If I close the OBS dock window for "Twitch Chat", the BUG stops happening.
This is an OBS-specific BUG.

There's nothing wrong with my monitor, cable, video card, operating system, or computer case. It's not the whole monitor that flashes, it's just the OBS main window (and sometimes the OBS stats window), like the video that I posted before shows. I use many other graphical-intensive applications on this machine including recording software, video editing software, video games, benchmarks, etc. and everything works flawlessly except for OBS.

In the meantime I also tried turning off G-Sync, but that also did not solve the problem.

As I mentioned before, at the moment that this BUG happens, nothing appears in the logs.
Anyway, I attached below the logs of an example stream where the BUG happened 3 minutes after starting:
- At 21:02 I started streaming and recording.
- At 21:05 the BUG started happening.
- At 21:06 I stopped streaming and recording.