Oops! I'm spreading lies. Sorry. HumanTex just put me right on this one over on the DAZ forum.

On the import options, below the crease setting, there is a '...' button which allows you to change the source runtime.

I feel a little daft for missing it, especially after I did a re-install just to reset the folder.

Sorry for the the mistake! Seems you can have as many runtimes as you like without problems in Carrara.

Neill