might as well run "equo libtest" while you are at it.
I have 2 systems on kde 4.6.2, 1 is gentoo, one is sabayon.
For those of us that installed it early, had a minor shut down issue, I also saw a few other warnings. for example, If I tried to launch apps as soon as the desktop appeared, A dialogue box would pop up saying klaauncher had not been loaded ... had seen errors about dbus also.
For me, I just needed to wait another 30 seconds for everything to load. On gentoo, after I got the update to fix the shutdown issue, I still could not shutdown from kde. After working on it for awhile with no success. In a user terminal,
mv ~/.kde4 ~/.kde4.back
When you restart kde, everything will be set back to default. You will lose your wallpaper, any custom settings you made etc..
All will be gone, and you will need to start fresh.
But this worked for me, and might fix your issues also. kde 4.6.2 is working fine here, the transition from 4.6.1 was a little bumpy.