Status update
I have upgraded to Mountain Lyon. Before doing this, I cleaned my application of a variety of outmoded programs plus Mackeeper. Subsequently, I have not had any problems shutting down.
Also, I checked with the Apple tech person, there is no problem with the rMBP having sufficient power to run an external display like my 23" Cinima Display.
Best, Mike
I have upgraded to Mountain Lyon. Before doing this, I cleaned my application of a variety of outmoded programs plus Mackeeper. Subsequently, I have not had any problems shutting down.
Also, I checked with the Apple tech person, there is no problem with the rMBP having sufficient power to run an external display like my 23" Cinima Display.
Best, Mike