When attempting to run Firefox, Google Chrome or other browsers on more than one station, you get the following error or one similar to it: "Application is already running, but is not responding".  To open a new window, you must first close the existing process, or restart your system.

This error typically happens when sessions share the same Windows user credentials.  As a best practice and intended use for NComputing's MultiUser platform, allow each station to have a unique login name and password to Windows in order for this type of software to run properly.