FAQ: How can I see what errors the browser is giving to the Web Viewer?

Create a file called debug.txt in the root of the Viewer (e.g. http://mydomain.com/viewerfolder/) to see if you get a response back or not from the browser.

Debug.txt will turn on PHP show errors/warning (setting PHP display_errors/error_reporting on at script level).  It will not log there, the errors will be displayed on the screen/server logs.