Using Blender 2.83 and wiggle_bones1_5_b16. I have recently rendered plenty of still-frame animations without this addon but after installing it, something has suddenly gone wrong. I want to render frames 1-24 into .png's, inside a folder with some gifs in it.
I have tried baking the keys for the addon but the same issue happens. Others are experiencing the same problem (see comments):
Uninstalling the addon, restarting Blender makes rendering work again even though some new bone properties get leftover.
It does have to do with the "Wiggle Bone" addon because I was just able to render successfully after uninstalling it again (its Properties get leftover in the bones but it is ok). But after installing it again, I have the same problem.