Hi Sebastien, Happy New Year to you too and thanks for the prompt reply. You were correct, of course. I was using a previous version of logback, because the IDE I'm using (Intellij) did not clear WEB-INF/lib before copying the JAR files, leaving the previous version there. Now that I use the correct JAR files, the filters work correctly. One new thing that I noticed, and I think it's a change from previous versions, is that when creating a context (LoggerFactory.getILoggerFactory()), this context is initialized with the default configuration which includes a console appender. In order to start from a clean slate I had to invoke shutdownAndReset() on the context before loading my own configuration. This is not documented, and frankly I think this behavior is incorrect. One last thing: what is the expected behavior of logger.isDebugEnabled(marker)? Thanks for your help, Yoram