I found a workaround: if I switch on Visual Effects (i.e. Compiz) then the problem goes away. If I set Visual Effects to None then the problem returns. I switched back and forth several times to verify.
I found a workaround: if I switch on Visual Effects (i.e. Compiz) then the problem goes away. If I set Visual Effects to None then the problem returns. I switched back and forth several times to verify.