Ok, so this may be buried somewhere on this forum already, but I never did run across it in my extensive google searching to fix this problem. So, I figure I will post up the problem I encountered with my MacBook Pro with Thunderbolt only ports and the "fix." It's a basic thing but worth posting since its somewhat unintuitive.

So, I obviously have a Firestudio Project and a MacBook Pro with only Thunderbolt ports. I buy the Thunderbolt to Firewire adapter from Apple. However, the supplied Firewire cable from Presonus is six pins on both sides and the adapter from Apple accepts 9-pin. So, being that I am pumped up to use my new equipment, I suck it up and head to the BestBuy to buy a new Firewire cable (at a hefty premium) so I can get to recording ASAP. First I buy the Rockfish one. It is 9 pin on both sides with an adapter that converts to 6 pin. In theory, this will work. However, no luck.. it's as if my MacBook thinks nothing is connected. Perplexed, I do a bunch of searching and really don't find much. I did find one post that said something about the RocketFish cable being junk and not working. So, off to BB to exchange for the Insignia one. Same configuration with the adapter, same problem. More searching reveals a post deep down that says the adapter on the cable is the problem. Skeptical, but out of options, I order up a cable on Amazon that is recommended on some other post here. (It has no adapter - it's the correct 6 pin on one side, 9 pin on the other). Impatiently, two days of waiting, UHG! It arrives, plug it in, and viola! That was it!!! Couldn't believe it! Not sure what the cables with the adapters are doing wrong but obviously you have to use one that DOES NOT have the adapter on it.

Anyway, posting this up because I feel like someone else might be in this same position given the fact that BestBuy is the ONLY place you can find any Firewire cables anymore and others might be impatient like me and go with that option and think there is a problem with their Firestudio. Hope this helps!