[rules-users] Gunvor Rule Editor problem?

I have downloaded Guvnor build 4122 from http://hudson.jboss.org/hudson/job/drools/lastSuccessfulBuild/artifact/tr... I'm using this version because of the BPMN editor provided. However, the Guvnor Rule Editor is not behaving the same. In the When condition, the action is greyed out and I cannot change the properties of the action I have added. A screenshot is upload to http://img693.imageshack.us/img693/2567/guvnorq.jpg I can't remember the all build number I have tried but 2 of them are build 4083 and 4097. In some cases, the Rule Editor is working as I previously used it but upon opening a model, it shows the screen same as 5.0 where a upload option is available. But, in some other build when the designer is loaded up nicely, the Rule Editor did not behave the same way as it previously did. If the Rule Editor has changed the way it works, please let me know how to go about edition the "Set value of XXX" option. Thanks. Han Ming