Problems IE+PHPDev and Protecte pages

Dear PHP list. I have a website (local) running on a Windows box. I am using : PhpDev5 (php,Mysql,Apache 1.x) I am using PHLib - where I then make use of the template and page auth functions of PHPLib What I have found, and this is my problem. The web application requires a login, all pages are protected, when you log in and start using the system the system would at random and at no particular page simply come up with the login screen, as if you are logged out. THE STRANGE THING IS: this happens with IE, if I open the site in Opera or FireFox then this never happens, I log in, work on the system for as long as I need to and it will never loose my login session. Only IE does this. As I said, I cant see a patern (time or certain page) What I have tried is to set IE to handle its cache differently (but none of these changes did anything) (i.e refresh page on every visit,auto, never etc) I don’t know where else to look, this just seems strange. Any help would be greatly appreciated. Anton Antonfh@gmail.com -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.1.385 / Virus Database: 268.4.1/308 - Release Date: 4/11/2006