i have the same problem. 4.12.3 is stuck on HTML loading after gathering startup data. i don't have a wireless setup here, and I have Limewire properly enabled in Zonealarm to access any port. I have Limewire 4.10 running on another PC right beside this one and the configs are identical. 4.10 is working fine.
i tried both the internet install and the full download install...same result.
i updated java to 5.0.7 as suggested, no change.
i also disabled Zonealarm, and tried again, , same result.
so zonealarm is not the issue, and I never run the WinXP Firewall.... so although the info msg is displaying a gif of the 3 zonealarm alerts, i can't see how that's the problem.

appreciate any help. thx.