Does anyone know if you can use the new Sun Java version 1.5.0 with WebFocus? We don't use MRE and I didn't know if there are any issues with upgrading. We are using WebFocus 5.3.3.

Yes you can I have Sun Java 1.5 + and it works, of course I switch between 4.3.6 and 5.3.3 which we are testing, so I have to switch to MS VM if I mark Java as the browser option.

Ah the joys of change.