This bug started on 173.14.34 version.
Run, for example, Mozilla Firefox (gtk2), geeqie (gtk2), audacious (gtk3), open the Options window, or any WEB-page with checkboxes.
Many checkboxes are shown as unmarked, but in fact they are marked.
To be sure, it is sufficient to move the mouse over them.
options before mouse move:
Not only checkboxes a disappear.
The buttons in firefox
and after mouse move:
Arch Linux i686 current, Xorg-1.12, Linux kernel 3.3.7, gtk2 2.24.10, gtk3 3.4.3, firefox 13.0, gtk2 xfce engine 3.0.0, gtk3 xfce engine 3.0.0 (xfce 4.10)
Hardware: GeForce FX5600 and FX5200.