I'm using Layoutmanager with manage set to true
Backbone.Layout.configure({
manage: true
which messes up rendering of the Backgrid.
When manage is set to false then the table is rendered correctly, but if I set manage to true, then the table does not render fully (no table head or body) but only <table class="backgrid"></table>.
I know this is an old question, but this is because both LayoutManager and Backgrid both use a "render" function. With manage set to true, LayoutManager overrides Backgrid's render function with its own.
The way I've gone around this is by making a new view that extends Backgrid and calling it's render function directly.