Why doesn't mountain lion remember my external display settings?

I'm a teacher. I have a 13" early 2011 MBP with mountain lion (10.8.1, clean install on new SSD). I have external monitors in my office and at home. I want them to be the primary when plugged in (with the menubar/dock, and the MBP LCD on the left as the secondary display). When I'm in classrooms, I want the projectors I connect to to be the secondary display (with the MBP LCD on the right as the primary with menubar and dock). Snow leopard remembered all of this for each display. Mountain lion doesn't. Projectors almost always come up mirrored even if I've connected to them before and reset it.
To make matters worse, the displays menubar option is gone in Mountain Lion. Argh........
Ideas?

Ok, I think I found a solution. I disabled the new clamshell mode behavior by using
sudo nvram boot-args="iog=0x0" and rebooting, make it work like snow leopard. Since, it seems to be remembering my 3 displays (classroom projector as secondary on the left, office monitor as primary on the right, and home monitor as primary on the right). The downside is if you connect everything with the lid closed and get only one display, opening the lid does nothing and there is no easy "Detect Displays". Maybe I can write an applescript to easily detect displays.

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One by one! Larry, Terence and Old Toad,
Thank you, all of you, for your helpful replies.
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I Thank you.
CD

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