The fan slowly ramping up suggests a power issue, maybe your power supply is too weak? Can you try to connect the Y cable directly to two USB ports on your computer's motherboard (the ports in the back of your computer, not those in the front, and do not use a hub, etc). Or maybe one port and one USB charger?
The camera sensor is actually detected the first time around (at 0.890189, which is when we probe for it). So it seems to be correctly connected, etc.
But it fails later, when the CPU is under higher load, so this could indeed be a power supply issue.
If you cannot get it to work after trying different ports on your machine, we can check the device here, please contact us through kickstarter so we get your backer ID, and we will ship you a replacement unit that we will test one more time before shipping to you.