We just upgraded our CMS to Astoria 6.4, and now all new projects fail to be created, surprising older projects can be returned without issues.
"com.idiominc.webservices.client.WSRuntimeException (covers java.lang.RuntimeException: org.xml.sax.SAXException: Invalid element in com.idiominc.webservices.data.WorkflowWSProjectType - optionalAttributeDescriptors)"