BleepingComputer.com: Firefox 3.5 and Secunia

I have a Compaq laptop. Key software components are:-

XP pro SP2 (fully patched) with IE 6 (patched)
Firefox (just upgraded from 3.0.17 to 3.5.7)
AVG free (also just upgraded from 8.5 to 9.0.725, virus DB 270.14.133/2612)
ZA basic firewall free 7.0.483

Two months ago, I did a secunia online scan through firefox 3.0 and it went smooth. Now, when I try the same through firefox 3.5, the scan cannot be started. I give permission to secunia's java applet, but the web page doesn't load fully.

I try the same scan through IE, and the process goes smooth.

I have another assembled PC, with similar software components as my laptop mentioned above. However, in this PC, firefox is still 3.0.17, and AVG 8.5 (updated). When I try the secunia scan through firefox 3.0 there, it runs smooth.

Any clues as to what is happening please? Thanks,

I do`t use AVG but I believe both it and ZA, depending on the version, free\paid, have script blocking options so it may not be a Firefox issue.

May be a situation with an older version of Java as well.