In order for the shared clipboard, dynamic display resolution, seamless mode and drag&drop to work, the user running the X.org session in a Gentoo guest needs to be part of the "vboxguest" group. Please add this information to the ebuild. Reproducible: Always
All current app-emulation/virtualbox-guest-additions ebuilds now contain the following in pkg_postinst: elog "" elog "Please add users to the \"vboxguest\" group so they can" elog "benefit from seamless mode, auto-resize and clipboard." elog ""