Mac OS X - Audio Visualizations issues, glitches
While a video is playing (not audio only file), selecting Spectrometer / Scope switches the video to the playlist and the playlist needs to be toggled back off to see the visualizer. Setting it back to disable also switches back to the playlist. Sometimes the video has to be stopped and restarted before you can switch back from the playlist even though the video is still heard playing.
If a visualizer is already selected and a new video is played from the playlist, it doesn't switch to the video but it does flicker and resize the playlist window briefly.