Someone forgot to kick the VDI instances in the farm to perform an automatic reboot.
Patch Tuesdays only work when you make sure that mandatory reboots are actually being done.
That also prevents users of getting confused by these System Modal dialogs:
[System Restart Required]
A newly installed program requires this computer to be restarted.
Please save your work and restart your computer. Your computer needs to be restarted by wo 11-4-2012 2:43.
[Restart Now] [Close]
[Restart Alert]
A system restart cannot be completed while another software installation is in progress. Please allow the software installation to complete before attempting a system restart.
[OK]
–jeroen