Something that often catches people out when using DriveWorksXpress to control the Configuration of a Weldment Part is the result of their Configuration rule. You must remember to include the <As Machined> or <As Welded> suffixes of the Configuration name, otherwise the Configuration change will not work. An example rule would be :
=ConfigurationName & "<As Machined>"
Hope this helps some budding DriveWorksXpress enthusiasts out!