The fix is for 4.2 only, so you will have to add this in your services/flipbook/pages/flashpageflip/book.xsl file of your 4.1 skins
<xsl:import href="plugin:flipbook://pages/flashpageflip/book.xsl"/>
<xsl:template match="/">
<html>
<head>
<meta http-equiv="X-UA-Compatible" content="IE=11" />
<title>
<i18n:translate>
<i18n:text i18n:key="PLUGINS_FLIPBOOK_BOOK_TITLE"/>
<i18n:param name="filename"><xsl:value-of select="$fileName"/></i18n:param>
</i18n:translate>
</title>
<xsl:call-template name="head-js-jquery" ></xsl:call-template>
<script src="
Unknown macro: {ametys}
" type="text/javascript"></script>
<script src="
Unknown macro: {ametys}
" type="text/javascript"></script>
<xsl:call-template name="css-flipbook" />
</head>
<body>
<div id="canvas">
<xsl:call-template name="top-actions"/>
<xsl:call-template name="html-flipbook-body" />
<xsl:call-template name="html-flipbook-footer" />
<xsl:call-template name="js-flipbook" />
</div>
</body>
</html>
</xsl:template>
The fix is for 4.2 only, so you will have to add this in your services/flipbook/pages/flashpageflip/book.xsl file of your 4.1 skins