As you can see in the title, lots of engines do not seem to be working when I turn them on. For example, an ion engines refuses to provide any thrust or Delta V when turned on, even with Xenon gas and EC. All engines with an exotic type of fuel like LH2 also don't work. For some reason the daedlus engine still works but that is besides the point. This may possibly not be an issue, maybe a feature, if it is, please help because none of the engines are working (except for classic liquid fuel engines). I only have interstellar extended and the fuel switch, I used Ckan.