After upgrading my desktop to KDE 4.2, I noticed that all the menu options in the file manager said 'No Text'! Turns out this is something to do with some borked permissions. Nice quick fix.
chmod 755 -R /usr/share/config
I noticed that the gentoo elog now has a message informing people of this fix.
On a side note.. OMG KDE are back! .. I tried 4.0 and 4.1 and only lasted about 2-3days with them before i went back to 3.5. But KDE 4.2 is really something special. Sure there is still the odd plasma crash, but it recovers nicely.