10.8.1 disables monitors when rebooting in 10.6.8

I just updated Mountain Lion to 10.8.1, When I reboot in my preferred OS (still 10.6.8), I lose the Apple Cinema Display driver and another driver for a cheaper Hanns-G monitor. Before updating to 10.8.1, while in 10.6.8 both monitors worked fine (for years). Each OS is installed on different volumes.
Today that changed. Before I rebooted into 10.8 I had two working monitors when booted in 10.6.8. After updating 10.8 to 10.8.1 I had 2 working monitors in 10.8.1. When I set my startup disk to be 10.6.8 the drivers appear lost (the Apple display works, but with a different looking driver) and the Hanns-G monirot is on, but black!
To test if the monitor was actually working I rebooted into 10.8.1 and both monitors were fine. When rebooted to 10.6.8, the Hanns-G was on, but black.
Does anyone have any idea what's happened? I don't understand how one OS can somehow affect another, even though they both reside on different volumes on different hard drives.
Thanks,
MartyP

Turns out I had to delete from both the Applications folder and an external drive that had a copy of the installer on it. Update notification didn't disappear until I deleted both, emptied trash, and ejected the external drive.

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