Comment 12 for bug 1014487

"aptitude purge virtualbox-4.1 and a fresh package install from virtualbox.org"

Fixed the trouble running virtualbox as non-root and root user.

After i received the message: "Failed to load VMMR0.r0 (VERR_SUPLIB_WORLD_WRITABLE)"

Fixed with:
chmod 0755 /usr

Now, when running from a terminal I get these message:

"
Error opening file for reading: Permission denied
Qt WARNING: QSpiAccessible::accessibleEvent not handled: "8008" obj: QObject(0x0) " invalid interface!"
"

But virtual box is working.