I’m creating a sub theme for Omega and am using a book for hierarchical navigation. The problem I have is that when I click on a link that is in the third level of navigation, the active trail isn’t set. E.g. when I go to the page called ‘what to do when things go wrong’, the first level nav isn’t highlighted and the second level nav isn’t shown:

It should look like the following:

I’ve created the following book:

My book outline for the third-level page looks like this:

It feels like I’ve done everything I need to set the active trail but it’s not working. How can I set the active trail?
The way I managed this in the end, was to create a new book at second level. Then use context module to apply the active menu trail.