FluorineFx uses Log4Net for logging.
Log4Net is configured using a custom configuration file log4net.config in the application folder.
Log files are created in the "log" subfolder (you have to add write permissions to the directory).
The default configuration logs to the RollingLogFileAppender with a daily rolling period. By default FluorineFx will log at the DEBUG level. Everything else (such as your applications logging) will log at the ERROR level.