A few months back, I got fed up with problems logging on due to the latest versions of Java not suiting Eurocontrol. I decided that I didn't want a second, older, version on my computer and so opted to use the non-Java-requiring Simple Mode instead. It was a simple thing to do via the My Profile/Password option at the top of the page and selecting the Simple Mode/Plain HTML access option.
Since then, I have had no problems although I only use it for PAMS Light in connection with flight simming. It may be that you need the Java version for whatever reason. If not however, I suggest you do what I did.
SFS