10.6.3 (I used combo update) horked up my Mimo 7" USB powered monitor (uses Displaylink drivers). I use the monitor in portrait mode and after the update my screen was "squished" so that it was only using the left half of the monitor, the right side was blank. I tried rebooting, then reinstalling the displaylink driver and rebooting, to no avail. Then I went into the display prefs and rotated the image to landscape and it's fine in that mode. Then rotated back to portrait and the image was back on the left half of the screen, the right half had a residual image of the landscape mode instead of being black this time. The monitor worked fine in all modes in 10.6.2. Guess it's going to be in landscape mode for a while....hopefully it'll be fixed in 10.6.4.