Polyphony when playing chords?

When entering a chord from my midi controller, only one note sounds, instead of three notes (if I'm playing a 3-note chord, for example). I noticed in a previous post (last year) that someone said that's what MuseScore does - although it will play back the chord AFTER you enter it. Is this still true? That it only plays one note of a chord when you are first playing it from your keyboard? Or is that something that's now been changed in MuseScore v. 1.2? And if it's been changed, how do you get it to play all the chord notes as you're playing it on your keyboard?

Thanks for your help.