Can't connect WDTV SMP to my iMac

hi there, thanks for this.

So I can now get the WDTV to identify my iMac, and the drives and folders connected to it.  It spots all video files I want to play.  But when I hit the play button, yes, you guessed, it’s that spinning arrow…

I’ve tried files of a couple of different formats, mp4, avi, I didn’t really think this was the issue, and it doesn’t make any difference.  Neither also does messing about with the ‘Linux Share (NFS) Support’ setting, as on or off it still won’t play.  And neither does where the files actually are, what the folder path is, whether they are on the desktop or on an external drive.  It identifies that they are there - but won’t play.

Not sure what to do next… I’ve run out of ideas.  What else do I need to change on the Mac other than share permissions?

Any offers appreciated,

K