User blog comment:Kirkburn/Technical Update: February 11, 2014/@comment-4839682-20140211205222/@comment-126761-20140212174739

Those two issues should be quite unrelated - could you please send in a Special:Contact about the comments issue with more details about it?

You don't lose any information by having the right rail below the content area - but it means the content area can be wider on smaller screens. Fluid width is entirely based on the width available on your screen - if you reduce the size of your browser window on a desktop computer you will also see the right rail collapse, for example.