Version 3.3.7310, installer
Main Player, in the right panel aka "Playing Tracks"
I formatted my PC a few months ago so I downloaded and reinstalled MB, last month I noticed that the skip track option wasn't there. Now I have to right-click the track and select "Skip Track". Before that I just had to select the track and then a "-" simbol would appear on the left, click there to lock and the track would be skipped until I click again. Can't post a screenshot right now, I will do that when is possible.