VirtualBox Can't Find USB Devices

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https://bbs.archlinux.org – Hi all,Just run into a USB issue in VirtualBox, I tried everything I can find on internet, but nothing fixes it.It used to work fine before, I don't know when was it broken. Here's some information:I'm running VirtualBox 4.2.6 on Linux 3.6.11-1-ARCH.I added myself to vboxusers, and I have export VBOX_USB=usbfsin ~/.xinitrcI also have VirtualBox extension pack installed.Now the weird part is, I can access USB devices if I run VirtualBox with root privilege, while with my own account, it shows the following error message once I click "Settings" button: Failed to access U (HowTos)