I have a mac Book Pro and and iMac, both with Thunderbolt. I connect my thunderbolt cable to each and each tells me that it is connected to the other, but when I try secondary screen in Aperture it is still grey and not available, what do I have to do to?

I have a Mac Pro and an Imac, both with thunderbolt. When I connect the two together with a thunderbolt cable each recognises the other as shown in the system report, but when I try to use second screen in Aperture, the option is still grey and unavailable. What do i have to do to activate second screen in Aperture via thunderbolt?

In actual fact this seems a bigger problem than I thought. Linking the two computers via the Thundernolt cable and selecting cmd F2 no longer shares the screen at all and Apple say it may not be able too in Mointain Lion - What are they playing at, hundreds of customers link computers together and share the screens - Lets hope they are wrong and tell us what we need to do other than move back to Windows.

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