Whenever I logout to KDM and login again (any user) all GTK aps aren't painted right: the windows are littered with black squares (the black text in them is rather hard to read). Especially Thunderbird, Chromium, Gimp, Synaptic have problems.
Better to show it in a picture:

Funny thing though: when I run any LibreOffice app, the above mentioned apps look fine again.
Did anyone had something similar?






