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I am running into a similar problem. I am running Groovy on Ubuntu 12.04. I just apt-get upgraded my ros-groovy packages (to version 0.5.4-0precise-20140417-0429-+0000) and now code that used to work fine is suddenly broken. I am simply publishing an empty message on a topic from javascript using roslibjs (revision 6) and subscribing with a smach_ros.MonitorState. I get the error: "__init__() got an unexpected keyword argument 'queue_size'". Would love some ideas for how to fix this. Is it an issue with roslibjs or rosbridge? What can I change to make this work again?