“You must close the following program before starting the browser.” Why does this occur?
Posted by Respondus Support

Many types of applications are blocked from running at the same time as Respondus LockDown Browser. These include screen capture, messaging, screen-sharing, network monitors, and several other types of applications. These applications can be shut down prior to the start of Respondus LockDown Browser, or you can let the browser close them automatically when it is launched.