Here we now use pageFlip version 2.x, with many functionality (zoom in, zoom out, print...)
If you are using XML mode on old version, please edit again the XML file and add the bold session to your book description:

<book bgcolor="0xCCCC99" pageheight="600" pagewidth="400"
minscale="0.5"        pagethickness="0.5"
    plugins="navigationbar, gallery, overlays, titles, anchors, swfaddress, links, keyboardnavigation, slideshow, options" asulextension="xml" >

Save the xml, your pageFlip work again, but make a  backup should be good before you install upgrade for safety.

 This is a list of sites (found on megazine site) , so you can see what people do with the pageflip