Hey Quentro,
I’ve tested the plugin with Kanso, and it looks like the “Automated” minify option breaks the theme’s stylesheet references. Please use the “Manual” minify mode in the “Minify” section of the plugin settings – in this case everything works fine ;)
Just a side note – I highly recommend to not use caching plugins while the website is in development, and only switch them on when everything is ready. This does not concern Kanso or any other theme in particular, yet is a general piece of advice for website building.
Sincerely,
Andrii / Satori Studio