Search by schedule in multi-city is ok: when the options are layed out row by row for the 1st seg, then scrolling down gives the second seg, etc.
When I do a r/t and it has 2 columns, one for the departure and one for the arrival, it does it every time. The default flights selected are the earliest departures, and when I select go to select the outbound, it will go ahead and proceed without letting me move the inbound.