User blog comment:Rupert Giles/Layout Changes: Breakpoints and Typography/@comment-5238398-20150601025624/@comment-1038387-20150601170842

I haven't had the RC search box issue in a while, but I've had issues with Search on pages I was editing on. I'll see if it persists and send a report later.

As for that preview issue - would a third preview button, Desktop XL, be an idea? It's probably not the most popular solution, but it would cover most bases.