Spotify desktop, OSX 10.11.5, iMac (27-inch, Late 2013)
When an ad plays the song timer freezes to the full length of the ad (e.g. 30s) and doesn't clear when next song comes up. In the place of the album cover and name of the current song are the ones from the song playing before the ad. In the place of the artist, is the text that shows during the ad.
Previous and next buttons remain disabled when ad is finished and if the current song is paused, it cannot be resumed, the button remains in pause state and does nothing. New song can be started but song info and song timer remains faulty, and buttons still do not work.
Next ad doesn't change the faulty information or fix the buttons. Quitting and reopening the application fixes the problem, song resumes from where it was left. However constantly reopening becomes annoying and troublesome since the bug can occur during every ad.