Try playing the game windowed and see if your firewall is asking for program permissions when JO goes to get a new list.
I seem to remember after I'd patched the game, it kept locking up when I started. This was because Zone Alarm was asking for JO internet access and waiting for confirmation, only the program was running full screen and was 'in front of' the prompt. Because I couldn't Alt-Tab back to it, JO wouldn't go any further. So running it at a lower resolution and with full-screen set to off, I could see my desktop while JO was running - and the firewall prompt. So when I'd confirmed the prompt, along with the 'remember this option' check-box, i was able to switch back to full-screen and future games ran fine.
Hope this makes sense, and I hope it helps too