ati-drivers only works if libstdc++-v3 is installed but the ebuild does not depend on it. This can lead to very strange problems (please read the link for more details). Reproducible: Always Steps to Reproduce:
For the maintainer (lu_zero?): http://bugs.gentoo.org/show_bug.cgi?id=84961#c17
Just for clarifications : I'm talking about the ati closed source drivers (media-video/ati-drivers) not the open-source drivers that come with the kernel/xorg.
Proper dependencies added, thanks
Closing