Do you know the reason whereby the following message appears (see attached photo).
The user has full license on the server where there are two apps with identical security (Windows access) settings in root folder. Both apps are browsable with IE plugin. In IE access point the user can open one of the app, but for the other app the server hangs/waits without giving anything, and when open in server on desktop is attempted the attached message appeared.
The problem was in settings - 'Reduce data based on section access' was checked in the problematic app. When this setting is selected, although there is no section access, somehow it blocks access to the document.