Nagios 3.0.6 auto refresh problem


I have a problem with Nagios 3.0.6 (on SLES 11). Auto refresh does not work, so if something has been changed,for example the host changed its state to down, I don’t get any changed state until I press reload button in IE7 (or Firefox). On the other side we have old Nagios 1.3 and everything works fine there, so I have changed cgi.cfg and nagios.cfg on the new nagios just like they were on the old one (like refresh_rate=90), but I got no results.
Could anyone help me, please?