Gentoo as Virtualbox guest - auto resize with standard user

[drillhead]

Hi,

I managed to install a nice Gentoo 64 bit Virtualbox guest and also unmasked and emerged vboxadditions 3.2.8.

Autoresize and seamless mode work when I start X (with KDE 4.4.5) as root, but with my standard user both don't work.

Although the solution might be easy, I don't know it and I'd be happy if someone could send me a tip.

Thanks in advance for any hints

[GES]

"# gpasswd -a <USER> vboxusers" ?

Me:
# groups ges
disk wheel audio cdrom plugdev games vboxusers ges
and good works

[drillhead]

The solution is

# gpasswd -a <user> vboxguest

Thanks for your help!