Darwin does not write to /var/dss/logs/StreamingServer.log

Dear All,

I'm running CentOS
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# cat /proc/version
Linux version 2.6.18-238.9.1.el5 ([email protected]) (gcc version 4.1.2 20080704 (Red Hat 4.1.2-50)) #1 SMP Tue Apr 12 18:10:56 EDT 2011
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# cat /etc/issue
CentOS release 5.6 (Final)

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My DSS admin console Error Log:
# Streaming STARTUP 2011-07-12 08:00:02
2011-07-12 08:00:03: WARNING: The module QTSSRawFileModule is not a compatible QTSS API module.
2011-07-12 08:00:03: WARNING: The module QTSSRefMovieModule is not a compatible QTSS API module.
2011-07-12 08:00:03: WARNING: The module QTSSHomeDirectoryModule is not a compatible QTSS API module.
2011-07-12 08:00:03: INFO: Module Loaded...QTSSFileModule [static]
2011-07-12 08:00:03: INFO: Module Loaded...QTSSReflectorModule [static]
2011-07-12 08:00:03: INFO: Module Loaded...QTSSRelayModule [static]
2011-07-12 08:00:03: INFO: Module Loaded...QTSSAccessLogModule [static]
2011-07-12 08:00:03: INFO: Module Loaded...QTSSFlowControlModule [static]
2011-07-12 08:00:03: INFO: Module Loaded...QTSSPosixFileSysModule [static]
2011-07-12 08:00:03: INFO: Module Loaded...QTSSAdminModule [static]
2011-07-12 08:00:03: INFO: Module Loaded...QTSSMP3StreamingModule [static]
2011-07-12 08:00:03: INFO: Module Loaded...QTSSAccessModule [static]
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The log file shows that QTSSAccessLogModule is loaded.
I have the error log files at /var/dss/logs/Error.log

but /var/dss/logs/StreamingServer.log is empty.

I'm using this server to stream playlists. The log files in the playlist folders also do NOT store any access logs.

Please help. Many thanks!