I have just attended the exam. I also have encountered the PC Hang problem. All the problem are on the Drag&Drop type Question which need to chose 7~8 item out of more than 15 item selection(In fact, it is to write EJB-QL using D&D). The question also has graph, table etc. Whenever I press the button to the question, a dialogue box appear say out of resource and then mouse hang and need reboot.
I read in the posts about DnD question problem faced by lot of candidates. I took the test on 6th itself and fortunately didn't face problem with DnD and it worked fine. I believe the problem may be with the OS (Win95/98). Sun should specify the requirements for the machine to be used and prometric should make all its centers compliant with the System requirements. Beta Exams are meant to evaluate the nature, difficulty, wording etc. of the exam questions and not the meant to be a beta testing exercise of the testing software. We can't blame Sun for this since making the test centers compliant with the requirements is the work of prometric.