My 2009 iMac running lion doesn't go to sleep unless Finder has focus. If Safari, or Mail, or iTunes or any other program has focus my Mac will not go to sleep or even display the screensaver. Does anyone else have this happen to them? I'm trying to decide if this is expected behaviour or if it's just me.
No, nothing like caffeine running. However, I also discovered that his only happens when a program running in full screen mode is in focus.
Seriously, nothing strange running, Safari, iTunes, Mail, iCal and Pages. It's a fresh restart too. This also happens without fail, like, if I ever walk away from my computer when any app is in fullscreen mode, the computer will not go to sleep or even switch to screensaver.