AppController::beforeRender() fails to fire when rendering an error page

Hey folks, strange problem here with Cake 2.2.1

When I have an error or exception, whether in debug mode 0 or 1, it successfully renders my default layout, but a bunch of variables have not been set in the view, because the chain of method execution never calls my AppController::beforeRender().  I thought the default error handling behavior was supposed to fire this to prevent this problem of view vars not being set.  I tried to overwrite some error rendering (similar to discussion in this post, the solution of which simply does not work for me) by creating CakeErrorController.php and returning parent::beforeRender() but this, strangely, creates an infinite loop.

I cannot figure this one out!  Help!

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