After a recent windows update (though may not be the issue), I am unable to run Ubuntu in the virtualbox with full screen mode. I can no longer stretch the window to any resolution. It is locked at 1024x768 in the guest window (Ubuntu). For sanity, I re-installed The Linux Guest Additions. I also tried uninstalling it and reinstalling it even though the script does this for you. No matter what, I can't get past the limited 1024x768 workspace. Furthermore, I noticed that xorg.conf is not in the /etc/X11 folder but I believe this is normal as my other PC running a similar setup also does not have xorg.conf yet scales the guest window of Ubuntu properly to any resolution (including true full screen mode). I have set the guest settings to 64MB video space and also tried 128MB. No difference there. I also tested running Virtualbox 4.1.8 (to try an older working version). Nothing. Now I am back to Vbox version 4.1.12 with no avail.
I am also unable to run the Ubuntu Desktop with advanced effects. Maybe the Linux Guest Additions is not running even though it is installed? How do I verify this?
Any other suggestions?