Expected: Track List fields show inferred values
Observed: Track List fields show blank... until:
2 In Track List select the track e.g.

3 On the selected track, click and hold mouse button, drag down to the next position and then up to the first position.
4 See inferred fields appear:

EDIT(TC) Tracked at http://www.ventismedia.com/mantis/view.php?id=6816