I had a similar problem when we updated our office Macs to OS 10.5.5. All of my font labels were offset in exactly he same way.
Strangely enough, we were in the process of changing our default font for all our documents at the time and when I changed the font, they all came back centered. When I change the font back, it still is offset.
My solution probably wont help, you, but it may have something to do with the OS update.
(P.S.: I'm still wishing for a universal font setting)