Hi
http://www.h-online.com/open/news/item/VirtualBox-4-1-6-fixes-3D-support-...
"Version 4.1.6 of VirtualBox has been released. The third maintenance
update to the 4.1.x branch of the open source desktop virtualisation
application for x86 hardware improves its overall stability and
addresses several issues found in previous builds.
VirtualBox 4.1.6 fixes a bug that prevented 3D acceleration from working
on Fedora 15 guests"
Rahul