I hadn't actively configured logging when I posted. Tomcat was logging, so I implied Hibernate could, too. I'm using embedded JBoss on Tomcat 6, so I'm not sure if Hibernate logging is/was configured at all. There's a log4j.xml file in Tomcat's lib dir. I can't say if it's evaluated for the config at all. I found this in there:
I put 3 files onto my classpath, that is the Tomcat lib dir:
Do any of your appenders have thresholds? A category enabled logging at a particular level for specific classes, thresholds filter out log messages for a specific appender. So logging could be anabled but hidden.