CentOS

Did you try using the check for update from the Virtual Box Manager. I have used this to upgrade for the last six months or so and it seems to work without problems.

I currently have five different live distributions not including the RHEL variations that provide garbgage video when starting. I have solved this with the RHEL variations (Scientific, Centos, PUIAS) by loading the proprietary script and everytime a new kernel is loaded in grub I add a 3 to the kern...