If nothing is logging here are some things to verify. 

• If using runtime property configuration, make sure you have added the target to the Log.Config.Targets collection
• If using an external Log.Config file, make sure the Log.Config file is in the same directory as the logging assembly
• If using an App.Config or Web.Config file, verify that there is logging configuration inside the file
• By default, any configuration errors or logging errors are ignored.  To override this behavior, turn off fail safe logging to see any configuration exceptions.  Example:  Log.Config.IsFailSafeLoggingEnabled = false
• If performing asyncrounous logging, any exception thrown will be in the Log.LoggingException property.  Wait a couple seconds for logging to occur using a Thread.Sleep and then check this property