If you listen to an audio file or media stream, in full mode, the Swirl setting of the Ambience visualization may freeze, and stay frozen after you come out of full mode.
To recover visualizations, select any tab other than Now Playing, or select another visualization.
To workaround this problem, do not use the Swirl setting in full mode:
1. Use the View menu to select Visualizations.
2. Select Ambience.
3. Select any option other than Swirl.