Why aren't any of my Folder Actions triggering?

Folder Actions seem to have been buggy for a lot of people in Mountain Lion (myself included). There’s discussion elsewhere on Ask Different about the unreliability of Folder Actions in general, and there are quite a few threads on Apple’s support forums about the issue.

Reinstalling 10.8.4 seemed to fix the problem for the OP, but I’ll note here what seems to be a common fix. The following practice, quoted from Jehan Alvani’s blog, has been cited in quite a few places:

1. Create ~/Library/Scripts/Folder Action Scripts/ and drop the folder action script you want to add in there.
2. Strangely, open System Preferences → Keyboard → Keyboard Shortcuts, and click the Reset to Defaults button.
3. Scroll up to the Files & Folders section, and make sure that the Folder Actions Setup… listing is checked.

I think you want to go to the Services panel within the Keyboard preferences pane, but I’m not certain. I’m not willing to try it since I don’t want to reconfigure my keyboard shortcuts if I screw it up, and I don’t use Folder Actions anyway.

I know the OP’s problem has been fixed, but this may be of use to other people facing similar difficulties.

Deleting the workflow and reinstalling it will get things going again:

1. Locate your .workflow file ~/Library/Workflows/Applications/Folder Actions/*.workflow

2. Move .workflow file to Desktop.

3. Delete the containing folder ~/Library/Workflows/Applications.

4. Move .workflow file from Desktop back into ~/Library/Workflows

5. Double click .workflow file to install.

I wanted to reiterate the solutions from Alex and others are excellent. This process fixed folder actions automatic processing, without needing a manual trigger.

1.Scroll up to the Files & Folders section, and make sure that the Folder Actions Setup… listing is checked.
2. Deleting the workflow and reinstalling it will get things going again

After this, my folder context manual show the option 'Folder Acton Set up', the 'folder action' can then be assigned

Have to say, Apple's guide/help/documentation on this topic is very bad. The interface design is also terrible, after assigning the "folder action" in context manual, there is no 'confirm/submit' button, very weird without more help like here to figure things out.