IIRC, the use CGI::Carp "fatalsToBrowser"; is highly dependent on how the webserver is configured to handle errors. By default a 500 error is returned by the webserver to your browser. It is possible that the webserver is trapping the errors and presenting an empty page as a security measure (for production this isn't all that unusual).

Along with the suggestions made already, I would contact your web hosting service and ask how the errors are handled. Perhaps they have a recommendation with respect to obtaining the errors. I suspect that you will have to trap the errors in your code yourself.