Since it happend 2 times on 2 different projects, I thought I would let you now:
When rendering an imagesequence (png, 16 bit), Octane saves the statusbar randomly on one frame.
Unfortunately I could not reproduce it nor see any pattern when it occurs. Additionally it seems kinda rare, I'd guess I rendered about 3000 different frames and got 2 errors like this.
It's not that big of a deal, though it's a little annoying to check every single frame in the final sequence.
Maybe you can use the information though.

Version: V4.0.1.1-R2, R19, Win 10, nvidia 417.71