im just playing around tryin to make a surf map, and whenever i move a vertex, it moves way out of place in game! stopping my surfing instantly. when i hit alt+p it says: "Invalid Solid Structure: The solid has invalid structure, probably as a result of vertex manipulation." i've trying grouping all the surf angled brushes together and they still move, i've made them all into a func_brush, and they still move. Any help is appreciated. Thx!