'Facebook Authentication Window Does Not Close After Sign-In

I am using the fb:login button on my site here: http://www.stellarconquest.com/play. This started recently -- in IE9 the authentication dialog does not close after successful sign-in. Here is the link in the pop-up for the stranded window:

"https://www.stellarconquest.com/channel.html?fb_xd_fragment#?=&cb=f171625b6c812fe&relation=opener&transport=fragment&frame=f30afb46b61a2a6&access_token=XXXXXXXXXXXXX&base_domain=stellarconquest.com"

I verified that this happens only if channel.html is used. I'm not sure what changed to cause this.



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