cups-1.1.13-r2 this ebuild changes permissions of / and makes it non world/group readable/executable... thus rendering your system unusable for non-root users. pretty simple fix... but I noticed that once my emerge completed, everything else on my system went awry. chmod og+rx / chmod o-t / makes everything happy again.
verwilst fixed it.. doesnt look like he updated the ChangeLog though... :-( looks like drobbins made a booboo when updating cups the other night and had an extra space in the pkg_postinst() somewhere.