I have SFC installed on several websites and it was working great. On at least two SFC recently stopped showing on the front end. It was working fine and is now not visible although it looks like the space allotted to it at the top of the posts and in the widget sidebar is still there.
Also, posting to my Facebook Fan PAge is still fuctional.
On one site I've switched over to the "Official" Facebook plug-in to regain functionality.
The remaining site that SFC is still installed on and it not visible is:
Any ideas on what to look for?