Out of sheer idiosyncrasy, I've developed the habit of formatting dates as dd.mm.yyyy rather than the more typical US mm/dd/yy (and long dates as dd mmm yyyy).

Out of sheer idiosyncrasy, I've developed the habit of formatting dates as dd.mm.yyyy rather than the more typical US mm/dd/yy (and long dates as dd mmm yyyy). Setting that as my date format in OS X for a long time caused the paper size to default to A4 even though everything else was set with US settings. Somewhere along the line, that particular "feature" was removed, although I couldn't say exactly when.