When I started quilting again, I bought a new Olfa cutter from WalMart. It didn't seem overly sharp and dulled quickly. Yesterday I bought a new blade at my lqs. The old blade has a round hole for the nut to go through. The new has a shaped hole. The new one is very sharp.
Is Walmart selling a knockoff blade? Do you remember the last time you changed a blade what the hole looked like? Does Olfa make two different types? My old cutters that are misplaced are Fiskars, so I'm not familar with Olfa. Just curious.