Hi Azen,
Can i e-mail you my scene? If so, to what e-mail address?
In the error log, i'm getting "failed to tonemap render pass "Beauty""

I have found out what the problem was, i'm guessing it is a bug.
If i have Alpha Channel ticked, this problem will occur (Using a HDRI, with only ambient light it there is no problem).
If i tick Keep environment the problem goes away.

I have tried Octane for an animation but sometimes i get som corruption on some frames. It seems that the frame hasn't been rendered to the max samples i set.
Tried both Direct Light and Path Tracing, with Direct Light i also got a few frames all black.
It mainly occures in the beginning and end of ...