I have Host OS -Windows-7 and Guest OS -Ubuntu 13.04. Problem is when I open any web-page in browser e.g firefox, I can't see the bottom of web-page. I'm facing same issue with Remote Desktop connection using Remmina RDC.
I had a similar issue and am running a 13.04 guest, I could not see the virtualbox menu tab and fullscreen windows would extend below the bottom of the monitor. Here is how I resolved it: As reference, take a look at these- http://ubuntuforums.org/showthread.php?p=8595940
Even though the resolution was set correctly in the "display" tool, the only thing that fixed it was setting it manually. First I tested to be sure with xrandr:
I had to minimize back to my host desktop (win8) and then back to the vm before I could see the virtualbox menu tab again, but the resolution changed immediately and no longer extended below the monitor. I wanted the change every time I logged in, so I did:
And then entered into the new file:
This has resolved the problem for me.