Regicide doesn't work for me, either. Changing any of the settings and uncommenting these two lines made no difference.
Viewing post in Make Visual Novels! RenPy Shader Pack comments
Try slapping this either in a block under that, or in the Regicide transform definition.
mesh True
so it would look like this:
show eileen happy with Regicide: mesh True
If that fixes it, I'll push out an update to make it part of the default Regicide setup. I thought I had already done that, but I might've missed it.