I have created a web app using the ArcGIS Online Web AppBuilder. The app works well for me; however, members of the group that I shared the app with only see a blank web browser with a gray background when they try to open the app. Any ideas?
Rickey, the app contains some information that I'm not at liberty to share, so unfortunately, no. I think the problem is related to what Tom Sellsted posted below.
Did they accept the invitation to the group? I think I had this issue and the users hadn't noticed their invitation to the group waiting for them to accept it.