Had to find this in the WoW UI forums. Mangle (Bear) and Swipe (Bear) need to have a very specific syntax to work again in macros. Copy n paste these, then bind them to mouse wheel up and down.
Mangle + Maul spam
#showtooltip Mangle (Bear)()
/cast Maul
/cast Mangle (Bear)()
/startattack
Swipe + Maul spam
#showtooltip Swipe (Bear)()
/cast Maul
/cast Swipe (Bear)()
/startattack