I have succeeded! I had to do two things. First, I had to point the ConfigurationAndWatch method to a file that actually existed. I had omitted a forward slash before "multiple_files.xml". Second, I had to add the attribute "additivity" and set it to false in the logger definitions:
<logger additivity = "false" name="BaseLogger"> <level value="DEBUG" /> <maximumfilesize value="256KB" /> <param value="DEBUG" name="Threshold" /> <appender-ref ref="RollingFile" /> </logger> Thanks for listening! RobR