Works for me. If it still doesn't work, you can also try:
- downloading a fresh copy of the java runtime (I think that's what its called ...)
- switching browsers; at one point, without me changing anything, IE worked with NP chat, but Netscape wouldn't
If you're getting a blank page, that's most likely the solution right there. Go to www.java.com and click 'Get It Now' to upgrade your browser's java. It doesn't take long if you're on broadband.