I recently installed this software and i was able to login to it fine in firefox, however in IE 7 i couldn't login, simply nothing would happen. No errors were showing up in the console. My first guess was that it had something to do with the session, so i pinned it down to this line
setcookie(session_name(), session_id(), time() + 3600, ((strpos($_SERVER['HTTP_USER_AGENT'], "MSIE 6")!== false)? "\\" : "/"));
that was failing for IE 7, and yes i have java installed, and it was listed as a trusted site. my friend also uses IE 7 and couldn't login either.
I changed the MSIE 6 to MSIE 7 in that line and it seems to have fixed it... but im not entirely sure what that line of code is doing exactly