Before the last update the forum width was set at a certain percent, now only the tool bar at the top is set to the correct width and everything else takes up the full screen width.
Ok looking at things it looks like it has been like that for a long time. I have a test server up running a two month old copy of the database and it is the same way.
In addition the log files show no one modifying the templates on the server since the 19th.