I installed an official SeaMonkey build after experiencing the same problems.I've just downloaded the Seamonkey-2.3.3.pet from wisdom-seekers.com and used Rox-filer to installed it in 214X-TOP and then rebooted the PC but it still fails to work when I click the menu icon. What's missing or done wrongly? Please help.
Instructions are here.
(You might want to go to SeaMonkey's website and select a newer version.)