I've never used this tool, but if the uploader isn't already doing this, it should randomly spoof the user agent with one from a regularly updated list of the latest versions of the most popular user agents (IE, FF, Chrome, etc). I'd also make it wait a random amount of time between X and Y seconds (user defined) before sending the next request to FB in order to stay under the radar.
LeFluffy: Wickedfire's Julian Assange.
trojan
Interesting! What Windows and IE are you running... sounds like Windows Server or some sort of really hardened build. It it is Windows Server, try this How to disable Internet Explorer Enhanced Security Configuration (IE ESC) in Windows Server 2008/2003 | Windows Reference
If that's not the case however, do you get the same security/certificate warning when you try to login to a different https site directly in IE (say like paypal or whatever)?