Searching by schedule--especially on multi-city routings--is a royal pain, if not impossible with the new booking engine. I actually ended up buying a trip last week via orbitz because not even the people on the other end of the elite line could come up with a solution. I commented how much I disliked the new engine while waiting, and the elite rep replied, "You're not alone." I find the fix above works for simple RT routings but does not fix the issue if you have a multi-city trip in mind.