AT the moment it looks like the main driver issues are with Mac hardware for the newer versions or Mac OS. There can be some problems with Firewire - I had plenty but the support was really good. I used the phone support and they had the unit back twice until I found out that the Firewire on the motherboard (although the correct sort - TI) didn’t seem to be doing the job. I had to install a PCI version of the same thing! Once sorted it hasn’t missed a beat. I recommend you read the install manual for the driver(s) as there are a couple of things that need installing and sometimes the firmware might need upgrading. I hope this helps more than confuses?