Regarding issues with website i feel i need to explain few things.
Website offers best user experience using Firefox 3.x. All other more or less mainstream browser engines are supported as well. Website is optimized and tested in Chrome 1.x, Safari, Opera, Internet Explorer 7.x and surprisingly we managed to make it work in Internet Explorer 6.x too. I should mention that this last two browsers should not even be called browsers.
Regarding older browsers like SeaMonkey 1.1.x, Firefox 2.x, Thunderbird 1.5.x. the site wont work. All i can do is advise you to update this browsers with newer versions, if not for browsing experience, for security reasons sure.
Horst, there is a SeaMonkey 2.0 official version soon to be released that will fix many of this problems. Alpha version can already be downloaded and tried.
If anyone else have problems with website usability let us know. At least for supported browsers there should be no open issues.