tRio uses a clever bit of software called PJA (see http://www.eteks.com/pja/en/ ) to do its screen rendering. Apparently PJA needs some changes to work with java 1.5 (see http://www.eteks.com/pja/en/forum/viewSubject.jsp?subjectId=481 ).

And so I'm afraid that until then, we're suck with java 1.4.2. I know that the install instructions say 1.4.2 or later - sorry.

Cheers
Paul