When Auto Play is enabled on audio clip in Preview section of the Inspector window and choosing an AudioClip through the "Object picker" in Audio Source component, the first selected audio clip will play, but subsequently selected clips will not.

1. Download attached project "901001.zip" and open in Unity
2. Open "Test" scene
3. Select "Cube" game object
4. In Inspector window, "Audio Source" component, select AudioClip "Object picker"
Note: In the opened window, the first selected audio clip will play
5. In the opened window try select anoher audio clip

Expected result: After you selected another audio clip in AudioClip "Object picker" window, it will automatically play that audio clip
Actual result: After you selected another audio clip in AudioClip "Object picker" window, it will not play that audio clip

Note: Make sure that Auto Play is enabled on audio clip

Reproduced on Unity 5.4.5p1, 5.5.3f1, 5.6.0f3 and 2017.1.0b1

Video is in "AudioClip bug.webm"