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You may try and reset the Lightroom CC 2015 preferences back to default also, check is your Lightroom updated to the latest version as well. CC 2015.10.1
Also, sign-out and sign-in from the creative cloud desktop to refresh the login on your machine.
Let us know if that helps.
This did not fix the problem.
Lightroom version: CC 2015 
License: Creative Cloud
Operating system: Mac OS 10
Version: 10.12 
I could not find the plist file as described in the link (yes, I can see the hidden lib files). However I did reset the preferences (shift option) when I restarted lightroom.
I tried exiting creative cloud and logging back in.
Problem still exists.
Please update your Lightroom version to its latest update CC 2015.1.1 and check if that helps.
also, if you post the screenshot of the problem as well.
Something really is wrong now. i can't update - I tried unistalling and reinstalling but l got an error during the install. if I try to open from creative cloud it just says waiting -- nothing happens. So now I cannot even launch LR. To make matters worse I can't even access the forums on my mac.... I get a "system error attempting to access forums....". I can access the forums on my phone though.
these all have to be related.... something is corrupted on my computer. Help
You may try uninstall Lightroom, restart the machine and reinstall it via Adobe Creative Cloud.