In order for CEA to work correctly your HR Admin are required to record your mobility certficate in two different places within the HR Admin role, this could possibly be what is causing the system to freeze (or is it just because it is crap!!). Also if you are claiming SENA that needs to be recorded by HR Admin as well.
A tip on submitting CEA, if you override the screen you claim wll first go to the JPAC to autorise before it goes to your local approver. Also JPAC say they are going to do pay runs on a weekly basis to pay CEA so the earlier you get it in teh sooner it gets paid and if you put it into a high interest account you will get something out of the system.. However, wether or not these weekly pay runs will ecer occur is another matter altogether......