DirectAdmin Domain Pointer

I've been trying to get some domains parked using DirectAdmin's domain pointers. I've searched for threads about this on Google, and followed the instructions. I go to Domain Pointers -> Add New Domain Pointer. I put the domain into the form field (leaving 'Create as Alias' checked) and click Add. I've waited for a few days to make sure there were no caching problems, and the domains still didn't resolve. The nameservers on my domain registrar are set correctly. I've parked domains before on CPanel and it worked just fine.