Yes, same thing here. I would also like to add that this is happening with my dual processor quad core intel xeon 32 GB RAM mac pro, while none of this is happening on my 6 GB RAM core I3 sony vaio running on windows. It is also worth mentioning that I’m using a Black Magic 4K SDI card on my mac pro and seems it could be the problem since I’ve read a lot of complains about that, but I’m still looking into it.
Have you found any other solution?