I had issues also with 3.6.15 Pro and XP. I finally resolved it.

I run two versions of Java on my system. I downloaded and installed 1.3.1_04. Then in the browser tab I unchecked IE and Netscape. I downloaded Java 1.4.1_04 and checked IE and Netscape in the browser tab. That ended my problems.

I hope this will help.

Norm