User blog comment:Rupert Giles/Layout Changes: Breakpoints and Typography/@comment-5238398-20150601025624/@comment-5275700-20150601164720

Fixes for the Chat module layout and bloglist headings should be out soon.

@Suminoma: The right rail moving to the bottom is the intended behavior at the "tablet portrait" breakpoint (the smallest one). If you are seeing that and have a display width (or browser window size) wider than 1024px, please do send in a bug report with screen shots and some more details about your setup.

@Tupka: We have a bug report filed (from your reports) about the search not working on RecentChanges specifically, and we can't reproduce it thus far. If anyone else is seeing this, please do send in a bug report. Have you sent in a report about issues with the nav bar and tabbed browsing? I can't find a report from you about it. If you are still seeing this, please send in more info!

@Biberoi: We're looking at what needs to be changed with Preview, thanks for your patience.