Win 7 host 64-bit, Linux Mint 13 Cinnamon 64-bit guest.
Before anyone asks, YES, I have installed the guest additions, and that's the first thing I did. I tried this two ways:
-- Installing from the image virtualbox gives you by going to Devices --> Install Guest Additions
-- Installing from repos (terminal --> apt-get install virtulbox-*)
Neither worked. I uninstalled the package managers installations, and instead went back to the first method. Two problems as of now:
-- Cannot enable seemless mode, try as I may. The option to do so is disabled from Virtualbox menu.
-- Cinnamon doesn't load (and if I do ALT + F2: cinnamon --replace, it runs, but not smooth and sometimes garbled images)
Help appreciated. If your answer is "install guest additions," you're not helping.