I'm not sure but i think that i found a bug... the swch doesn't activate or deactivate with PSCN or NSCN... i'm using is as i always used it, but now it won't work... i need it in my new creation, so help...! :)
Works fine for me. Check you're not in heat gradient view, check the PSCN/NSCN being sparked is within a 2 pixel radius of the SWCH, and check there isn't any INSL in the way.
If it still doesn't work, please post an example save.