Oh yeah, there is a highlighted-button bug, sometimes happens when you copy a button to a new toolbar. Button still works though. Just a PITA with something visual like the Restrict-To-XYZ axis buttons.
Yeah, polyboost beats this hands-down. But if you don't wanna shell out, pior's method is do-able, just time-consuming. He's extruding edges, not planes. It does make planes, but instead of snapping those he's really moving the edge that he's pulling out, snapping that onto the highpoly faces as he moves it. You have to…