Hello. I have registered in a hurry to ask a question about my Mac's bizarre behavior. I was watching a movie on Quicktime in fullscreen mode last night, and suddenly, the the screen moved to show me a desktop. My hands were not anywhere near the track pad, but somehow the desktop was shown on the screen on its own. Quicktime player was still in fullscreen mode. After examining console, I saw these messages: 1/22/15 10:48:38.317 PM authexec: executing /bin/sleep 1/22/15 10:48:38.322 PM authexec: executing /usr/sbin/chown 1/22/15 10:48:38.428 PM authexec: executing /bin/chmod 1/22/15 10:48:38.535 PM authexec: executing /bin/chmod 1/22/15 10:48:49.892 PM authexec: executing /bin/chmod 1/22/15 10:48:49.998 PM authexec: executing /bin/rm I have no idea what these are Also this morning, I noticed that my Mac woke up on its own: 1/23/15 11:17:45.000 AM kernel: Wake reason: XHC1 The only things that were plugged into my iMac are external Super DVD Drive, Apple numeric keyboard and APC back-up. There was no power outage this morning. Usually, I press a space bar to wake up my iMac, hence getting EHC2 message. Should I be worried? I have late 2012 iMac with 10.8.5. Thanks in advance.