I have the Vyper Novo and it uses a similar cable if not the same. The issue is in the cable, even though the computer displays Data Transfer. The data does not transfer until you start seeing a line running under the words Data Transfer. My cable went bad after less than year, ended up buying an after market one that was cheaper and better built. Before you give up completely try inserting the cable a few times, each time wait a few seconds with the cable inserted before trying again because there is a slight pause when it starts to down load. I am assuming you are turning the cable clock wise after you insert it.
Thanks for your reply.
Yes I insert the cable into the DC with the red dot on top, and then rotate it.
I then get a message that says "Data Transfer", but nothing. My Mac is about 4 months old, and the D4i is brand new and came with the supplied cable from Suunto.
I've tried all the USB ports on my Mac and have let the DC sit with the "Data Transfer" message for well over an hour now, and still heart break.
I sent a message to Suunto, but I'm doubting a return message will be anytime soon coming.
I'm going to try it on a 5 year old PC laptop I have and see what happens.