Facebook Like Box Shows 0 Fans?

I put Facebook Like Box at my videoblog site and so far it works really well. It shows how many Facebook users who “Like” my videoblog page. It worked really well, but not in the last few days. I thought it only happened to my , but when I randomly visit some blogs using this Like Box, the same thing happened.
But, this ‘problem’ didn’t happen if the box is displayed using . I use XFBML, so do the sites using the same code. Hmm… not sure what happen, but it’s not working really well right now. Any thoughts?

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