I'm not entirely sure what the problem is -- players are unable to open cuboid editing mode without having to /ps cuboid open, and when they do, punching blocks with/without a tool does nothing. Tried using the latest dev version as well as the one on bukkitdev.

i have the same problem, using the latest dev version.

What version of bukkit you guys using?

1.6.4, and yes iv tried with both latest dev and for the 1.6.4 version

Believe it or not, I forgot that I posted this lol. I actually somehow had a corrupted .jar, all I had to do was redownload it, and it worked fine. I don't have the problem anymore.