I'm using a Touch rather than a Glo. And I see an occasional freeze when changing the font settings for a book. It usually happens when I do a few changes in one session. The size of the book also seems to have an affect. For a long book, the freeze might happen on the third or fourth change. For a short book, it might take ten or twelve changes. I think it happens quicker when changing the font, but I have had it when playing with the margins and line spacing.
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