Prior to applying build 4560, when I switched my Vista virtual-machine to full-screen mode, while attached to my 23" Apple Cinema HD Display, I was able to run at the full resolution of the display (1920 x 1200). Since upgrading, the maximum resolution that is available to me in Vista is 1600 x 1200. What happened? (I did upgrade Parallel Tools to match the product version, btw.)
Resolved This problem seems to have resolved itself through a shutdown and restart of the Vista virtual machine. Odd...