I'm having the same problem. After the upgrade from plesk 7.5.2 to 7.5.3 some of my client can't login to their webmail when they use AOL. They get the following message:
"Your Internet Address has changed since the beginning of your Mail session.
To protect your security, you must login again."
Also I have one case using IE. This client gets a JavaScript error like:
"Line 49 char 9 Error: Object doesn't support property or method.
webmail.domain.com/horde/imp/loging.php"
I can connect myself to my webmail with no problem but some how this client can’t using IE
I've been looking in Google for a solution to this issue. I know is a session problem but I can't fine anything substantial.
I keep looking if I find something I will post it here.
Thanks
Miguel