User blog comment:Susanolivia/Fixed Width, Sidebar, and the Removal of Monaco/@comment-1073312-20101020174100/@comment-1066636-20101025073214

The content width is ~50px less than it was for a fixed-width Monaco skin. While you're right that tables designed for 1280*1024 (and up) didn't work on those Monaco skins either, even templates designed to work for 1024*768 on Monaco need to be reworked. In quite a few cases those 50px are the straw that breaks the camel's back; what was just about ok on fixed-width Monaco, now requires an extensive rework for Oasis.