I’m on a Macbook pro with the latest Cubase 8.5 and experience dropouts every time I select or deselect record for an individual track during recording of multiple tracks. Also whenever I add an insert effect during play. Pretty frustrating! Tried all the suggestions in the thread on CPU dropouts nothing so far.
Nobody has been answered by Steinberg for months on that thread so I am starting a new one. Not good service at all on this 
Model Name: MacBook Pro
Processor Name: Intel Core i7
Processor Speed: 2,5 GHz
Number of Processors: 1
Total Number of Cores: 4
L2 Cache (per Core): 256 KB
L3 Cache: 6 MB
Memory: 16 GB
Chipset Model: NVIDIA GeForce GT 750M
Type: GPU
Bus: PCIe
PCIe Lane Width: x8
VRAM (Total): 2048 MB