Adding sling loads in free flight mode

Hi all

Posted this in the Milviz support forum with no luck so thought I would try here 

Now that I have the FSX se version of the great milviz uh1c I thought I would Set up a sling load free flight Like I have with other helicopters which all work 
successfully.

I have copied the hoist and sling entries from my other aircraft and copied to both the air cfg file and the saved flight file like my other sling load flights but the uh1c is not showing the attached cable.
When I launch the uh1c saved flight the enabled hook show up very briefly on the top right of the screen then disappears.
Just wondering if any one could shed some light

Cheers


Rhys