I have Debian testing, I use XFCE. Recently, shortly after dist-upgrade, I noticed that XFCE terminal has some noise in it - especially near the end of long lines or when I use midnight commander. The noise looks like that:
I started using gnome-terminal instead and problem disappeared.
Now I noticed I have similar problem with GIMP - the toolbox contains noise instead of tools:
I can't even guess where should I start investigation. Is it problem with GIMP, XFCE, GTK, X, hardware? Or something else? I tried to start raw X, without any window manager (without Gnome, without XFCE etc) and problem is still the same - so I guess it's not X's fault.
What do you advice?