Windows 11 random black box in middle of the screen that will tab out anything on the main monitor

Hi BoredSoviet,

I am Dave, I will help you with this.

That looks like some corrupted app, when that appears in the middle of your screen, open task Manager (Ctrl + Shift + Esc), select the Processes tab, can you see what process that app belongs to and if so, right click it and choose 'End Task', does that black box disappear?

I ended the task, it is roblox and it doesn't just happen on it, it happens on all the games I play so I'm not sure if it will just fix roblox or all of the games.

(It only will happen on games)

I looked through all of the processes and found nothing that could cause the black square, Should I do a system restore or do a complete reset on my pc?

Not sure if you solved this or not - I had exactly the same issue after changing screens yesterday (Acer Predator Z35P to 2 x MSI MAG27s), same black box, cannot interact with it, cursor is above it, desktop background is behind it, open windows are also on top of it - nothing seemingly obvious in task mngr, then read this thread today, took another look, noticed Razer Synapse (32bit) running, ended that and the box vanished.
Ran an update to Synapse, box hasn't come back so far.

Going to boot a few usual suspects (random games and processes) and see if it pops up again.
- 2070 RTX Super
- Z390 Carbon
- i9-9900K

Hope this helps

Not sure if you solved this or not - I had exactly the same issue after changing screens yesterday (Acer Predator Z35P to 2 x MSI MAG27s), same black box, cannot interact with it, cursor is above it, desktop background is behind it, open windows are also on top of it - nothing seemingly obvious in task mngr, then read this thread today, took another look, noticed Razer Synapse (32bit) running, ended that and the box vanished.
Ran an update to Synapse, box hasn't come back so far.

Going to boot a few usual suspects (random games and processes) and see if it pops up again.
- 2070 RTX Super
- Z390 Carbon
- i9-9900K

Hope this helps

I can't even open synapse like the thing gives me a UAC and when I click yes, it repeats

Hey so I tried this but there's 0 apps open and I'm currently searching but I can't find anything could you give me other tips on how to fix this problem?

Sometimes, a big rectangle appears in the middle of my screen when I try to do homework or even during a math test. It's quite annoying because my entire screen blacks out before the rectangle appears. However, I can still do things through it.

I have a screenshot of it it is just being stubborn and does not want to upload.

Came across this today - the advice to look at task manager is good, for me it was the windows 11 preinstalled version of MS Teams, ended it thru the icon tray and it vanished. Could just be an app reacting oddly to resolution / frame rate changes.