I repro’d the issue using the same drivers as the OP (346.03.05f01), which are the drivers for El Capitan 10.11.3. However after installing version 7.5.25 of the CUDA drivers for mac (NVIDIA CUDA 7.5 for MAC OS X release), the problem went away. It doesn’t seem like CUDA should have an effect on this particular issue, but it might be worth a shot for anyone else that comes across this!