Tony,
Which LP_XMLConverter did you use? Is it from an ARCHICAD or from the LibDevToolKit? Mac or Windows? Which main version and build?
There was buggy LP_XML.xsd file earlier, if you know where to find it, you should add a new line under the ContPen tag (somewhere around line 470…): <xs:element name="ContVis" type="BooleanYesNo" />
I can help you where to find that, or send you a proper file if you answer my questions above.
Gergely Fehér
Team Leader, Library Team
GRAPHISOFT SE