After 10.6.4 update I cannot use iMac 27" as external display

I've routinely connected my work laptop to my iMac via the DisplayPort to use it as an external display. This morning this is no longer working. I updated to 10.6.4 last night.
When I plug the DisplayPort cable into my laptop the iMac screen goes black as it should. I can then select dual monitors. For a moment it switches to the laptop setting. When I then click "Apply" on the laptop to configure dual monitors it gracefully switches back to the Mac desktop (which is wrong).
There may be other causes of course. I strongly suspect a 10.6.4 bug however.
Has anyone else noticed this?
Message was edited by: jfaughnan

If you applied the update through Software Update, that is the delta version. Try installing the Combo version over the current system. That often fills-in-the-gap for various issues.
http://support.apple.com/kb/DL1048
Dah•veed

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After 10.6.4 update I cannot use iMac 27" as external display

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