On the upper right corner of all my windows there are supposed to be three buttons: one to minimize the window, the next to maximize it, the next to close it.
At the beginning there was only the one to close it, then I personalized my PC with the order I described using this command:
gsettings set org.gnome.desktop.wm.preferences button-layout ":minimize,maximize,close"
It worked fine until at least two days ago, but this is how I see those buttons now
As you can see, I see a cloud of points instead of the actual buttons.
This happens in ALL windows except the ones that use the QT toolkit, like TexStudio, for which I have other glitches.
The screenshot was taken from Gedit, and it happens also in Firefox and in the file manager (Nautilus).
How can I solve the problem and restore the correct graphics for those buttons?