Rekordbox 3 - SD Card not visible in devices

Hi there and happy holidays to you all. 

I have been using recordbox 3 for some time now and have added several playlists to my 32GB SD card and have not had any issues, until now. The issue i am having is that Rekordbox does not appear to be picking up the SD card in devices when its inserted into my mac. The card is definitely connecting to my mac as i can see it in the finder window, just not seeing it in RB. What is even stranger is that explorer window in RB can see it too.  Please see the attached screenshot i have taken - My SD card is called MUSIC 32GB and I have attached a screen shot. I am not having any issues with the USB as devices seems to be seeing USB OK.

Can anyone shed some light on this for me. 

thanks in advance 

Steve