Hmm, it shouldn't be crashing. Usually, when the syntax is wrong, I just get a red error message. Also, it's weird that reinstalling didn't fix it... Is there anything weird about the test video you're using?
I don't know where your Svp directory is, but it should be there, at the default install location, right?
I know this isn't a solution, but have you considered using mpv instead? Svp performs better with it, it does everything MPC+MadVR does, and ffdshow/avisynth aren't involved which means it'll probably get around the issues you're having.