Upscaling and frame interpolating video introduces wobbling distortion

Hi, I am trying to upscale and frame interpolate a video from 960x576 with 2x upscaling and output as 25fps real time. I have not enabled any of the other parameters like stabilization.
This has worked really good for me, until today after updating to the newest version.
Is this a common bug? Is there a way to reverse the update so that I can keep working with the last version? I am in a time crunch as I have made this process an important part of my workflow when creating animations for a documentary which is nearing deadline.
All help is appreciated!