Mailing the story:

Robolinux now supports the newest version of VirtualBox, 4.3.6, which has webcam sharing and many new improvements; the Windows virtual machine installers have been completely re-written to support VirtualBox 4.3.6; all Robolinux versions prior to 7.4.1 do not work with the newest Robolinux virtual machine installers and Stealth VM software tools; completely new Stealth VM software tools have been released and may be downloaded after making a very small donation.