I see them nice and blue but I cannot reference them in a sketch or use them for a sweep, or even measure them...  These curves were present in the model I recieved.  I cannot even figure out how they got in the model - or what feature they belong to.  Because I cannot select them.  I made a composite curve that looks the same and they all go away when I hide reference curves.  But I can select the composite curve and use it for stuff.  The other curves seem to be untouchable.  Any ideas?

Thanks

-Nate