I'm willing to bet you use zonealarm..
i had the exact same problem yesterday when trying to connect to battle.net. Turns out that ZA doesnt have the "authority" to shrink down a fullscreen program to alert you to an access request.. heh, i spent 30 mins trying to work it out before i closed the prog and noticed the dialogue box...
dont forget to mark the thread "solved" with the thread tools above!
