Uploaded avatars appear as broken image

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A new user on my hosted site tried to upload an avatar today, but it appears as a broken image.

http://expats.askbot.com/users/14/billbingham/

I notice if I right-click on the image and select "show image in new window", the URL of the avatar image looks a little fishy:

http://expats.askbot.com/upfiles/askcre.com/avatars/BillBingham/resized/128/awesome.jpg

Notice askcre.com in the middle of the URL. I tried replacing that with expats.askbot.com, but that did not seem to fix the problem.