My MBP 13" was running real sluggish, shut it down and rebooted. When screen came back on after logging in, it was flickering, could not get desktop to stay on, screen did not go black, it was like it was trying to load the desktop picture and dock would not come up. Did this for about a minute and quit flickering and screen came on steady. Dock finally came up and everything now is running. Has anyone else had this happen? Machine is a little over a year old and no issues until this. Running Maverick newest version, 2.9 GHz and intel core i7.