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stirtloe
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NWZ-W273S - Content Transfer MAC Problem

I am running OSX 10.11
My processor is an Intel Core i5

When connected to the mac with the supplied USB cable and dock the walkman appears as a disc on the desktop I can drag and drop folders into it using Finder.
 
However the sony content transfer app does not recognise the walkman. It just stays on  "Please connect the device". 
 
When I connect to my Windows laptop the windows content transfer app works; so the fault must be with mac content transfer app.  I have deleted and reloaded Content Transfer.
 
- any suggestions?
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