I created an ERD in the data modeler in 4.0 and tried to print directly to the printer. I saw in the windows print que a flash that the printer received a request but didn't print. I saved and closed 4.0 and brought up in sqldeveloper 3.1 and was able to print fine. I am running on windows 7. I suspect a bug.
thanks for reporting the problem. I logged a bug.