I have a site using version 4.08.04.  The home page has several portals - one portal is working correctly, but two others will not recognize my  logins.  If you go to the sites url the page loads correctly.  When you login in, it simply ignores the login.  Even if I login as host, it ignores the login. It still shows Register and Login in the upper right corner of the page just as though you had not logged in.   If I login with an incorrect username or password, it shows the Login Failed.

Some users are not have any problem logging in - so the problem is selective in that it only does it for certain users and me - the host. 

Should I delete the portan and reconfigure it?  If I do, can I save all the work that has been put into the original one and copy it into the reconfigured site?

Before your question I had not tried it with any other browsers.  I downloaded Firefox and DNN worked correctly.  I switched over to Internet Explorer - and DNN ignored the login.  So it appears that Internet Explorer is the problem.  First of all - Thank you very much.  Second - is there a fix for the problem?