Sorry for the trouble. I hope this will help. Clearing browser cache and then logging in using a new "Incognito" (Chrome), "Private" (Safari), or a similar window. Try signing out of the app and then signing back in. The app should usually be available afterward. If not, try a different system. Try checking these things and report back with any observations. Thanks for your patience in resolving this problem.
I was curious if the users encountering difficulties viewing the libraries was possibly related to different types of accounts being used. I see that you have an enterprise membership. With the way accounts work, it is not possible for an enterprise user to share libraries with a user with free or an individual type memberships, you would need to share from enterprise to enterprise or free/individual to free/individual.