The strip of alphabetic quick-access letters/buttons in perform-view is lost when returning to the list from the detail display of a song.
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To reproduce:
1. Chose a setlist or smartlist long enough for the A-Z strip of quick-access buttons to be displayed. The list must be displayed in perform-mode.
2. Tap any title in the list to bring up text and details for that song.
3. Return to the set/smartlist and observe that the A-Z strip of buttons is gone.
Please send a message from Help > Request Tech Support so I can see your device details and app settings.
Also, the shortcut buttons only appear in smart lists, not in set lists.
Okay, I see the problem and this will be fixed in the next update in a few days.