I fixed the problem. It had to do with PatcherLibResources.dll. This new version should now be safe to use. I will be uploading it soon.
Uploaded. See first post. Still requires .NET Framework 4 though.
By the way, I am getting an approximately 60% productivity boost (I always time myself when I work, it's not just a random number) from this so if you ever had to work on arms or if you do regular ShiShi checks, you gotta be using this. Apart from that, you would otherwise also be producing better quality sprites with higher frequency ShiShi checks. As per always, work on your sprites frame by frame for best results.