Lightroom CC (2015) will not open

Installed Lightroom CC (2015) and the app will not open. OS is OS X Yosemite 10.10.3

OK, just found the solution on one of the other forums: DON'T "quit" CC you must sign out instead
Click on your CC icon.
Click on the gear icon.
Click on Preferences.
Sign out of CC.
Sign back in.
Don't click on "Quit."
I had been QUITTING CC and relaunching. Try signing out.
This worked and everything seems to be fine. Dave

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Robert-
please try signing out and back in (different from quitting the app) see this link:
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Donald J Kipke, EA
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Lightroom CC (2015) will not open

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