mc_ott, you are correct, I can confirm the same behavior on my Mac OS X Sierra installation. Setting the infill to 0 and saving it, then going back in and changing something elsewhere and saving causes the infill to switch to 10. In my case, changed the first layer from 0.35 to 0.3 and hit apply. Going back to advanced and the infill tab, the value is 10. It also seems to do this with other infill types, not just Cubic.
I've also noticed that the clear scene menu (cmd-x) is always grayed out and the only way to remove an object it to select it and hit delete.