Recap: Select the small square book in book module. Select spine in multi-page view - confirmed with yellow outline. Double click or change to single or double page view. In type (Myriad Pro) selected centred in both width and height and entered text in black in colour select rectangle, 30pt 100% opacity. Text does not appear/disappears if a. opacity low, b. white text on white background (or black on black) or c. larger than 34pt - check that one of these is not the cause.
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