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Recently upgraded to Mountain Lion, noticed my screensaver has stopped coming on (on mains, my laptop will quite happily sit awake and idling for 4+ hours.

My power saver settings are on 15 minutes to sleep, sharing is disabled on everything, and for some reason my screensaver time has been greyed out - I hadn't noticed that before and was wondering if it had any fundamental causes?

The laptop is a Late 2011 MBP 13, connected to a NAS drive (but not actively, same happens when disconnected). Connected to an external display, no apps in the background.

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In addition to no screensaver, it also doesn't sleep? – GEdgar Oct 7 '12 at 0:04
    
Indeed. It'll just sit idling for hours - I left it doing some FTP operations last night, in the hope that it would sleep on completion - it didn't. – George Pearce Oct 7 '12 at 11:53
    
@iampearce what is your screensaver currently set to? is it a built in or third party screen saver? – Stu Wilson Oct 7 '12 at 13:28
    
Built in, tiled images coming from a folder. I don't have caffeine or anything else like that enabled which would block it, either. – George Pearce Oct 7 '12 at 15:05
    
Since it doesn't even sleep after 15 minutes of no activity, maybe there is always activity ... something is going on all the time. – GEdgar Oct 7 '12 at 15:15

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