Since VisionX 2.0 we have a feature that checks "application healthieness". This feature is not important for end-users but could be important for developers. If a developer manually changes source code of an application, it's possible that the application has compile problems after next VisionX update. This could happen if an API was changed or a library was missing. If an application couldn't be updated or has other unexpected errors, you'll get following in VisionX

Application check

If you click on the black sign, you'll see all problems. You can export the list and after all problems were fixed, the application sign will be removed. It's not possible to start an application with such a sign because you could destroy parts or the whole application. It's a quality improvement for VisionX and you.