Black border after render

Hi, on my flipbook render I have a strange black frames - how to fix this?
Embergen 1.0.2
no looping

this comes from a mismatch of the render resolution and number of frames. So if your render is 2048x2048 you’ll want the rows / columns to divide that number evenly. This is something we will hopefully address in a coming update, but for now this is the necessary workaround.