Example webapps failing in Tomcat 6.0

Some example webapps are failing in Tomcat 6.0 - namely mydvds-example and paranamer-example - with exception:

org.apache.jasper.JasperException: /calculator.jspx(4,51) Could not add one or more tag libraries.
org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:40)

Manually removing taglibs standard.jar yields:

org.apache.jasper.JasperException: /index.jspx(59,90) The w:form tag declares that it accepts dynamic attributes but does not implement the required interface
org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:40)
org.apache.jasper.compiler.ErrorDispatcher.dispatch(ErrorDispatcher.java:407)