I am very surprised that worked at all. Technically speaking Apple only supports one DV camera/DV device, regardless of how
many FW Controllers you have, although I have found in newer versions of Mac OS X it seems to deal better with DV sources so long as they are on a unique bus. However, Apple does not support that, their mantra is one DV device per computer, period. DV devices normally listen and broadcast on ISOCH channel 63, which means no matter how many busses you have, there will always be conflict if they are all trying to access the same channel. This could be what you're running in to, two identical cameras colliding on the same ISOCH channel.
- Making Space Commonplace
Live shows produced on a 12-Core MacPro, ATI Radeon HD 5870, 8GB RAM, 3 BMD Intensity Pro cards and unicorn magic