Oracle released VirtualBox 4.0.10, a maintenance release of VirtualBox 4.0. It comes to fix many bugs like proper device detection on RHEL/OEL/CentOS 5 guests, fixed disappearing settings widgets on KDE hosts, VT-x detection on Linux 3.0 hosts and fixed a memory leak during VBoxManage guestcontrol execute, for more about this release please check the changelog.
Oracle released VirtualBox 4.0.8, a maintenance release of VirtualBox 4.0. It improves stability and fixes regressions. Important bugs were fixed in this release, for 3D support: fixed GNOME 3 rendering under Ubuntu 11.04 and Fedora 15, Mac OS X hosts: fixed incompatibility with recent Mac OS X versions in 64-bit mode, for more information check […]
Question : How to fix: VirtualBox Callee RC: NS_ERROR_FACTORY_NOT_REGISTRED Answer: remove tmp vbox files under tmp and (dot)vbox-usernames directory rm -rf /tmp/.vbox* This method was tested under Fedora 14 and Opensuse 11.3 and 11.4 and it was working fine