GWT 2.7.0 and logging

Hi all,
I've just tried GWT 2.7.0. My app inherits com.google.gwt.logging.Logging and I've some problems to understand the new behavior of the logging module. I read in the Library Changes Section of the 2.7.0 Release Notes that
"The new default is to log messages at level SEVERE and above to the browser's console".
However, whether I try to set the log level from the url (?logLevel=<new log level>) or from the .gwt.xml file (<set-property name="gwt.logging.logLevel" value="<new log level>" />) the log level is not changed and the logging is performed at SEVERE level.
Moreover, debugging the com.google.gwt.logging.client.LogConfiguration.class and its method setLevels, the strange behavior is confirmed. If a log level is found in the URL then the level is set (the statement l.setLevel(level) is executed but the logging continues to be executed at severe level) but if a log level is not found in the URL the default level is set and the content of the .gwt.xml file seems to be ignored.
I wonder where I am going wrong. The logging of my app works with GWT <= 2.6.1.
Any help will be appreciated.
Best,
Lorenzo