IE6 login issue, known issue or something I did?

Hi -

Today we discovered a pretty weird bug in our highly customized live Elgg site.   If a user tries to login to the site using IE6 and does not check the "remember me" checkbox, the homepage just refreshes and the user does not get logged in (no error messaging or anything like that).

If I check the remember me checkbox when I log in, I can log in just fine.

Wondering if this is a known issue with IE6 and Elgg 1.5 or something that I broke while doing my development.

And yes, I know, I know, noone should be using IE6, i've told the client this a million times, but unfortunately a lot of their target audience are kids/teachers at school and many schools are still using IE6, so I need to support the browser.

Thanks,
Jordan