Hi, I have a weird problem and am flummoxed. I have oxygen 11.2 + xep + docbook 5. Up until now I've had no problem rendering it with the XEP engine. Settings are right, The docbook project validates according to Oxygen. However, if I try to do the usual transform to make a PDF from XEP, I get this enigmatic error without producing a PDF. Started: "C:\Program Files (x86)\XEP\xep.bat" -fo "I:\My Documents\work-related\myproject\index.xml_xslt" -pdf "I:\My Documents\work-related\myproject\myproject.pdf" (document [system-id file:/I:/My Documents/work-related/myproject/index.xml_xslt] (validate [error] Attribute 'content-height' cannot have a value of "px". [validation total: 1 error] Parse error: Invalid XSL FO source 'file:/I:/My Documents/work-related/myproject/index.xml_xslt': 1 error found during validation Process ended with exit code: 0 I have no idea what's going on. I understand that it's talking about FO (I sort of understand what it is). To my knowledge I have not specified content-height anywhere in the xinclude files or the customization layer. I cannot find px anywhere. The PDF generates successfully if I switch the rendering engine to Apache FO, but that does not help. My customization layer is pretty basic (see below), and I have not changed anything recently. I realize I have not given you a lot of information here, but can you guess where the problem lies or how to solve it? I get the sense that the problem may lie with my images in my source xml, but I just don't know. Any guesses? Thanks.... (I have a deadline for Monday, so any guess would be appreciated). <?xml version="1.0" encoding="UTF-8"?> <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns="http://www.w3.org/1999/xhtml" version="1.0"> <xsl:import href="http://docbook.sourceforge.net/release/xsl-ns/1.75.2/fo/docbook.xsl" /> <xsl:param name="xep.extensions" select="1"></xsl:param> <xsl:param name="preferred.mediaobject.role">fo</xsl:param> <xsl:param name="insert.xref.page.number">yes</xsl:param> <xsl:param name="page.height">23.4cm</xsl:param> <xsl:param name="page.width">15.6cm</xsl:param> <xsl:param name="page.margin.inner">1.91cm</xsl:param> <xsl:param name="page.margin.outer">1.27cm</xsl:param> </xsl:stylesheet> -- Robert Nagle