When you have an ngRepeat directive that uses track by, be sure to move the track by instructions to the very end of your statement, i.e. behind any filters.

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Consider the following:

ng-repeat="child in category.children track by child.name | orderBy:'name'"

This will silently skip ordering; here is how AngularJS sees it (parentheses inserted to display binding strength):

ng-repeat="child in (category.children track by (child.name | orderBy:'name'))"

Working

Moving track by to the end will correctly apply filters.

ng-repeat="child in category.children | orderBy:'name' track by child.name"

For clarification, here is how AngularJS interprets our expression above:

ng-repeat="child in ((category.children | orderBy:'name') track by child.name)"

Note: Angular 1.3 introduces aliasing using as. Since I'm bound to Angular 1.2, I could not try its binding strength.