External monitor not working after ML upgrade

I have a late 2008 Unibody Macbook and normally use it in clamshell mode with a Samsung 2043NW monitor if I'm in the office. Previously working fine in 10.5.8 through mini display port adapter. Upgraded via fresh install of 10.6.8 to ML, and the monitor flickered on occasionally but otherwise would not work - when it did display it showed the same resolution as the macbook screen i.e. 1280 X 800 instead of 1680 X 1050.
There's a thread here related to this: https://discussions.apple.com/thread/2387462?start=15&tstart=0  but this software was not the answer. I can now view the screen, but it is still being sent a resolution of 1280X800, rather than 1680X1050 (i.e. a fuzzy mess). It also will not work in clamshell mode at all, and just goes to sleep when the case is shut.
Anyone have a solution for this, or have I been 'obsolesced'? Does anyone have a unibody Macbook that DOES work with an external monitor?

OK, now here's an interesting thing - the macbook has begun to work in clamshell mode. This is REALLY weird. Tried again this morning in the hope of getting back the monitor control icon in the toolbar and it booted straight into clamshell mode with the lid shut.
When I first had this running 10.5 it would only work in clamshell mode if you pressed the power button and immediately closed the lid before the screen lit up grey. More recently it has been perfectly happy to enter clamshell mode after a period of use normally, just plugging in the monitor and shutting the lid. It would be nice if this behaviour were to start again soon.

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