OK, here's my latest findings.... It was cross domain privacy policies for me. What do you have your privacy set to in IE?
I set the following at the beginning of the ces_cookies.php and that has fixed my problem for IE. Works like a charm now.
PHP Code:
header('P3P:CP="IDC DSP COR ADM DEVi TAIi PSA PSD IVAi IVDi CONi HIS OUR IND CNT"');
Found another problem though. And not sure if it's your script that's doing it or not! It seems when I try and login
without checking "Remeber me?", it logs into all sites except the one I'm actually logging into? Any ideas on that one?