Just checking in to note that I have the same problem with iCue. Any time iCue has run on my current rig, software that utilizes Iray for rendering becomes unstable to the point of being unusable. When I try a render, I get the exact same black screen behavior and then am greeted by an error message when the screen comes back.
I've found this issue to be 100% repeatable. If I don't let iCue run at boot, then I can render all day long without any issues. The very first render attempt after loading iCue ends with the black screen cycle.
Since this rig was built for rendering and Corsair won't let me render on it, I don't think I can justify having Corsair controls in it much longer. What a disappointment.