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Hi Same problem here and after this effect is showing up more and more applications behave the same way. Only a reboot is the solution. After a couple of minutes, sometimes 1 hour ore more the effect shows up again. I couldn't find a solution until now and I'm still searching what causes the problem. What I see for example is that the following Process is hanging in "U" State (Uninterruptible Wait): # ps -aux: # user 320 0.0 -0.6 374084 11736 ?? U 2:21PM 0:00.56 /Applications/System Preferences.app/Contents/MacOS/System Preferences -psn_0_1966081 This is the System Preferences. Anyone knows what could cause these kind of problems? P.