Yes, i saw the vanished lines in your screenshots and i belive this may
be #385026, which is GTKDFB 2.8.x related and affects all HW platforms.
As Frans said, this is a quite annoying bug and i'll try to see if i can
fix it in GTKDFB 2.8.20 with a small patch (but i'm not sure it's going
to be an easy fix).
Is it fixed in 2.10.x ?
Basing on my past tests with different GTK+ 2.10 versions, it is.
This would be a reason to go with gtk 2.10.x, those packages are built and
uploaded to experimental, right ? So we could do a second build using the 2.10
stuff ?