Parental Controls Always Allow does not work

I have enabled Parental Controls on my son's MacBook Pro (OS X 10.8.1, Mountain Lion) and have restricted the applications his account can use. Everything works fine with the exception of Minecraft (of course the application most important to him). Minecraft is marked as an application that he's allowed to use in the parental control settings.

When I try to start Minecraft under his account, a message pops up saying that he's not allowed to run it, giving the following three options:

• Always Allow
• Allow One Time
• Cancel

When clicking Allow One Time, I have to enter the admin account username and password and the game starts without problems. But when I click Always Allow, it asks for the admin account as well, but then pops up the same message again. I have verified that I'm using the right admin account username and password, but it's still refusing to run the game.

When I disable parental controls, everything works, but the moment I turn it on again, it fails, despite having Minecraft in the list of allowed applications for his account.

In the Console application, I can see the following weird error message whenever this happens:

com.apple.launchd.peruser.501[148]:

([0x0-0x11c11c].com.Mojang Specifications.Minecraft.Minecraft[1216])

Job failed to exec(3) for weird reason: 13

Has anybody else experienced this or knows how to fix this?

There's a similar discussion here, but it doesn't contain a solution:

https://discussions.apple.com/thread/4012269