On rare occasions, an app's window will appear as a black box instead of showing the app.
This is a case of "turn it off, then turn it back on," specifically,
In the Appstream...
If, when signing in to Apps on Demand, you see this message:
"Unable to authorize the session. Cross account access is not allowed."
it means you have probably selected the wrong class...
If, when signing in to Apps on Demand, you see a message that says "Your request included an invalid SAML response," it means you are not included in the group authorized for access to this...
If, when signing in, you see a message that "No streaming resources are available for your session," it most likely means that at the time you tried to sign in, all available AppStream sessions...
If, when signing in to Apps on Demand, you are asked to "Select a role," it probably means you have multiple sets of permissions in the service. Select whichever option matches the class you...
If one or more applications appear off-screen, it is likely a resolution problem, either in AppStream or on your local device.
AppStream: In the AppStream Navigation bar, click Enter...