Auto Log-out when trying to send in OWA?

So. You get a call like this:

The user could log into fac/staff email, but when he tries to forward or send something, OWA logged him out. He was using internet explorer 8. I had him open Chrome, attempt to send a message in OWA and it worked. I asked him open IE up again, go to tools-->internet options-->privacy and adjust settings to medium (and turn off popup blocker) and everything then returned to normal.