Coldfusion cookies are not working in IE8.0 browser

Our code is working fine in IE6.0 and Coldfusion 8.0 and recently we moved from IE6.0 to IE 8.0. After that, some of the user are complaining that they are not able to see some contentlets, when we saw the code
userid is not showing as null and thats why it is not showing that contentlet. Why Userid cookie is loosing the values in IE 8.0

we tried following options to add into code to fix the problem.

<meta http-equiv="X-UA-Compatible" content="IE=EmulateIE7" > 

Right now we are using following some backdoors to resolve the issue for the timebeing..

1) close the browser (ie8), delete internet cookies and the reopen the browser.
2) changing temp storage from 8 MB to 50 MB

But we need permanent solution. could you please help me out..

somebody suggesting that convert cookie variable to either Session or Request variable. But there are 100s of pages needs to change..

Please let me know is there any alternative way to fix this issue.. If no alternative soltuion for this, then i will make a plan to change the variables either session or request (which one do you prefer ?)

to resolve the issue.

Thanks
Ram