Procedure not working to zoom out in VariAudio

In the “Sample Editor” chapter, under the “Understanding the waveform display in VariAudio” section, on p.468, the following procedure has no effect:

“If you hold down [Alt]/[Option] and double click in an empty area, the display will be zoomed out to show all segments.”

Nothing happens when holding Alt and double-clicking in an empty area. The VariAudio segment is still fully zoomed in.
I’m using Windows 7 x64.