Thanks! Unchecking and having stuff in place helped getting past the checks and cooking worked nicely. Not sure what would have happened if the chef had blown up.
Not sure this is related to the bug I just posted, but have you tried older daily builds at school? (Heck, I'm not even sure I posted it in the right place now...)
For me e.g. the older build 6869 works and the newer 6993 and 7000 I've tried now don't.