(#5) Unauthorized source IP address

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Hi all, our site started throwing the following error on the bottom of each page "An unexpected error occurred.
(#5) Unauthorized source IP address"

http://www.vantagewestrealty.com/...

Our site has been up for years and hasnt been changed for quite sometime now.

Host Gator tells me this "The error reported, "(#5) Unauthorized source IP address", means that IP from which you are making request to whichever API you are using does not match what is listed in your application. You will need to update this information in your application"

I've done a bunch of online searches which seems to point to something to do with the facebook open graph...

Does anyone have any idea how to fix something like this?

Would really appreciate any input.

Thanks so much

Mark