Actually, it seems to be a problem that mc_mm_switch parameter isn't set when I do an include like this: .lib "/home/mrg/demo/sky130A/libs.tech/ngspice/sky130.lib.spice" tt Adding .param mc_mm_switch=0 before the .lib fixes it. I had a slightly older version of the library on another machine that worked, so maybe this got broken in the libraries?