Installation was fully standard (jbpm-installer from jbpm-5.1.0.Final-bin.zip), except for the designer, which is your unofficial designer-1.0.0.054-jboss.war to enable saving expression language setting.
DroolsGuvnor is reached as http://localhost:8080/drools-guvnor. Default login is guest.
>> Also if you have Guvnor jaas auth and/or rolebased auth turned on.<<
No, I don't even know what they are.
Also I tried to generate a png. Log was:
2011-08-22 15:22:21,939 INFO [com.intalio.web.server.TransformerServlet] (http-localhost%2F127.0.0.1-8080-6) check connection response code: 204
2011-08-22 15:22:24,568 INFO [STDOUT] (http-localhost%2F127.0.0.1-8080-5) INFO 22-08 15:22:24,567 (NilAuthenticator.java:authenticate:35) All users are guests.
2011-08-22 15:22:24,569 INFO [com.intalio.web.server.TransformerServlet] (http-localhost%2F127.0.0.1-8080-6) create connection response code: 405
Much like before, with TransformerServlet in place of TaskFormsServlet.