Cannot enable aero after turning on (and then off) battery stretch

I have a T520 running Win7 x64. I turned on battery stretch in the power manager the other day, and after turning it off I cannot enable aero again.
I've selected an aero theme, but windows does not turn on aero.
A screenshot of my desktop settings is here - as shown I have a aero theme selected but both appearance and  properties tell me aero is disabled.
http://imageshack.us/photo/my-images/440/aerok.png/
I'm seeing a lot of advice on how to disable it but unsure which to follow. As this problem seems to have ben caused by the power manager I was wondering if any others had experienced this and could advise on how to fix it.

I just tried to enable and disable it and it appears it is not reproducible.
I suspect it somehow got confounded by the fact I have a few monitor configurations I use:
1. Work - displayport to U3011 WQXGA and d-sub to a samsung UXGA
2. Home - displayport to adapter to WFP3007 and laptop lcd as secondary screen
3. Road - laptop lcd
I quite often change the order in which I power/suspend/resume and plug/unplug the various monitors and windows (somewhat understandably) throws a hissy fit from time to time. So I guess this was just another case of that

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