Please update bumblebee theme to version 1.7. New version fixes white-on-white issue for inactive selections in GNOME 2.2. Update is extremelly simple - copy gtk-themes-2.0-r1.ebuild to gtk-themes-2.0-r2.ebuild and change bumblebee-gtk2-default-1.5 to bumblebee-gtk2-default-1.7. Reproducible: Always Steps to Reproduce:
r2 added to the tree. I didn't have a further look at it, but it's likely more versions have updates. Maybe you have time to check that out for us ?