crwdns2934241:0crwdne2934241:0 mayer

crwdns2934249:0crwdne2934249:0:

I don't think you have a problem.  I believe Utube in its loading process halted the shutdown and was running in the background.  To be sure do a "force quit" Command, Option, ESC and it will bring up a box of all the programs still running.

crwdns2915684:0crwdne2915684:0:

open