Comment 17 for bug 1239384

I am happy to report that running VirtualBox 4.3.2 r90405 that this is now working again for me in Ubuntu 13.10. I was even able to get the auto mount on boot to work by adding the line to the rc.local file at the end.

I reference my saved bookmark for how to setup shared folders at the end is how I set the auto-mount up.
http://www.giannistsakiris.com/index.php/2008/04/09/virtualbox-access-windows-host-shared-folders-from-ubuntu-guest/

Thanks to Ingo for the good advise, because VirtualBox 4.2.x told me it was entirely up to date -- I would have never guessed there was a 4.3.x