Pop-Up Windows close as soon as i click on them.

So yeah. This problem has been happening almost over a year,
when i open color mixer window or similar to select something
as soon as i click something on the window it closes instantly. It wont even select
what i just clicked, it just closes. Out of 1 to 10 tries it actually works.

I have so far lost my nerve millions of times because of this, its absolutely infuriating
and makes the progress of creating ten times slower since i have to search everything
from Project view and drag & drop stuff from there.

Anyone has any idea what is going on? This has been happening since 2017 Unity versions.
Clean Windows install as well, so cant be that.

Still happening in 2020.2.0f1

I’ve commented a couple of days that I had exactly the same issue. Since then, I’ve upgraded from 2019.3.14f1 to 2019.4.0f1 and it never happened yet.

Coincidence or fixed?

I upgraded to 2019.3.15f1 and it didn’t fix it.
Holding the mouse pressed longer on the button showing the window fixes the issue (thanks @Sephyk2 for the solution)!

I’m still facing this issue in 2019.4.1f1