Check to see whether any books have become "stuck" while indexing; this can cause the home screen not to correctly refresh.
To do this, go to the home screen, tap the "Search" button, and enter a string of random letters as a search string. When the results screen appears, if the "Text in Books" option is not greyed out, tap it, and see if it displays a message of the form "NN books not yet indexed".
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