Indented Custom Menus Broken in Lightword 2.x

On Lightword 1.9.x I had a custom menu at the top of the site. I have one page, many top-level categories. Several of the top-level categories have sub-categories.

In the WP admin editor it looks something like this, where PX is a page, CX a category and CX-Y a subcategory.

P1
C1
C2
C2-1
C2-2
C2-3
C3
C3-1
C3-2
C3-3
C4

On LW 1.9.x this worked fine. Since upgrading to 2.x, the menu stops rendering everything after the first indent. In the above example, you wouldn’t see C3 or its subcategories, nor C4.

If you move C3 so that it follows C1, it would appear but then C2 would dissapear. Starting again from the above, if you move C4 to follow C2 then it will appear in the menu, but C3 will still be missing.

Cheers