I had a transparent squid proxy setup and was having issues where yahoo attachments after scanning and enabling the interface to download them would logout a user when clicking the link. Thinking this had something to do with the switching back and forth from http/https and being transparent, I setup the clients with a proxy and removed the redirect firewall rule and set squid to not be transparent. The problem still exists though and searching the net shows others with the same issues but I haven't found a solution yet.
Thanks! jlc
