I have updated my MAC to Maverick and Adobe CC and all was fine till the main screen disapeared but tool bar remains. I unistalled, re-installed...rebooted, and spent three hours on the phone with New Delhi trying to reset Java, permissions etc...still nothing. Does anyone have any idea here how to get the screen back?
Did you change your monitor resolution or disconnect a second monitor?
If so, your main window may be off your screen.
Just trash your Photoshop preferences by holding down Command+Option+Shift on the Mac or Control+Alt+Shift on Windows as you launch Photoshop, then click on YES when asked if you want to delete or reset your preferences.