EDIT
No problem… just don’t be a ditz like me and remember to check the OS of your machine. I was running 1.11b on my A4 and I updated C6 to the latest 1.51 version and it wouldn’t send/receive.
I thought I had tried everything - put it down to OS X updates screwing with C6 but realised otherwise when I woke up with a fresher head… doh!