I would like to preempt any flames by stating straight out that I'm not sure whether this is a Fedora 16 issue, Kernel 3.1 issue, or VirtualBox issue. I have posted this on the VirtualBox baord as well, and I'm sure others will come across this problem.
I upgraded from FC15 to FC16 using preupgrade. Immediately after upgrading Fedora, I updated my VirtualBox from to 4.1.6 r74713 (from previous 4.1.6 release).
I now get the following error from VirtualBox when I edit my VM settings:
Failed to access the USB subsystem.
Could not load the Host USB Proxy service: VERR_DISK_FULL.
Since I have plenty of room on my file system, I'm guessing that this is either a permissions problem or a problem with a change in how the USB pass-through works on kernel 3.1.
A couple of notes:
* I have checked that my VirtualBox extensions are successfully installed, and that I am still a member of vboxusers.
* This is my desktop installation, and has worked well with VirtualBox since it was originally installed years ago as FC11 (this is not a basic installation issue)
Any help is very appreciated.