MacOS High Sierra 10.13.6 (17G2307)
Broken: Version 2.79 (2.79 2018-09-12, Blender Foundation)
Worked: Version 2.79b (2.79b 2018-03-22, Blender Foundation)
Short description of error
Blender ID authentication appears to work. Blender Cloud plug-in complains "Please log in on Blender ID first".
Exact steps for others to reproduce the error
1 - Start blender
2 - Open user preferences
3 - Navigate to Blender ID authentication plugin config
4 - Login successfully using Blender Cloud credentials. Observe "Authentication token is valid" with green check mark (see image below). Note valid token expiration date.
5 - Navigate to Blender Cloud plugin config
6 - Observe "You are logged in as ..." status
7 - Click on Find version to load button
8 - Observe warning message "Please log in on Blender ID first" (see image below again).
Attempting the exact same actions with the official Blender 2.79b release successfully retrieves saved settings from Blender Cloud.