I submitted bug 548626 regarding the fact that the guest VM does not recognize the fullest screen resolution of the host monitor. My bug report was closed as being "notabug." This was also identified as a bug in report 479792 previously. In addition bug reports 474831 and 509117 document screen resolution issues related to the guest. These bug reports were also closed with no corrective action.
This is a bug and needs to be addressed.
Paul