New user of Parallels 10, Windows 10 Preview, on Mac OS X 10.3 using a MacBook Pro Retina. I notice that if Parallels is running, the MacBook sometimes will not wake up normally from sleep. I have to hold down the power key until I hear the chime, then it comes up with just Parallels running - all other apps are closed. This is not a consistent problem but happens maybe 2X week. I have reset PRAM and SMC with no change. If Parallels is not running, I have never experienced this problem. Do I have a setting wrong?