The news came out a month or two ago. After however long of allowing custom FBML tabs at 760px width, Facebook decided they liked them better at 520px so the general info column could stay on the left. At that time, nobody knew when the change would happen, though estimates were for October. Since then, the change has been made, and any custom tabs that were set for the 760px width are now getting cut off and losing that last 240px off the right side. Lets just hope the powers that be don’t decide to shrink the pages further before they all get cleaned up…