I have gotten emails saying people have been booted... but of course they dont say what browser they are using.... but the only time i can get it to boot me off is with 6.0.2800.1106, so there is probably other versions that are doing it...
It looks like it may be an issue with your lightbox_plus.js javascript (line 404 reads -> obj.style.cursor = 'pointer'; <- which is not supported by IE < 6.0.2900.2180). If you remove that line it may work better for you.