Same problem with second screen here. Used to work fine but now, even though I can call up both screens, if I put the main computer to sleep the second screen (another, older imac) will wake up shortly after showing its own desktop. When I switch back to 2 monitors I find any of the windows that were open on the second screen 'lost in the wilderness' and unable to be recalled.. its a pain in the backside.
Ballindalloch
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