IMac does not show open windows in Mission Control

Ever since I installed Mountain Lion on my 2008 iMac 24", I've had a problem in Mission Control where the Desktop that the OS boots into will not show a preview of any windows open in that desktop. I have a new 2012 MacBook Air that does not have this problem. I thought the 10.8.1 update might fix it but no luck. Originally, I upgraded from Snow Leopard but eventually did a clean install and manually restored documents so that all the preferences/system files would be fresh, but still no luck.
A screenshot of what I mean is attached. I have FF open in desktop 1, but it does not show at the top, whereas all other desktops show window previews.
Has anyone else had this problem and have you managed to fix it?

I dont use the Trackpad, just a mouse. Moments after I typed it, the answer was suggested already:
CTRL+Mission Control button does exactly what I want.
Is it possible to reconfigure this shortcut to the Snow Leopard way? (Pushing and holding the mouse button on an app in the dock for the same results)
Thanks,

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