At some point in the devolpment of our project the intentions stopped working when "use default hints" is selected. The moment we change it to "use custom hints" the intentions work again. It doesnt matter if one of our custom hints is checked or no hint at all is checked , as long as "use Custom hints" is chosen.
I entered a warning into the isApplicable of our intentions, so that I can see if it gets called with "use default hints". I does not! Not only our added Intentions stopped working, also all normal Intentions of MPS stopped working.