My organization is currently using Server and Portal 10.3.1, and I have created and published map viewer app for one of our departments. Each user in the mentioned department has their own seat (sign in credentials), and are members of the group I set up for that department. The map viewer app has been shared to both the group and whole organization, yet for some reason a few of the users in the group are unable to use the basemap gallery and other tools/widgets such as the print tool in the map viewer app. The widgets appear in the app, however they do not render anything when clicked on. Any ideas on why this might be, and/or how to solve this issue?