I've noticed that it's a bit hit-and-miss under linux myself. But so far I haven't spent enough time on it to work out what's going wrong. Something to do with the applet repainting (or lack thereof).

Do you know what java run-time version you had in your 9.1 set up? It may be worth trying the latest 1.4.2_07 from the java web site.

Sorry I can't be of more help.

Cheers
Paul