Permission denied is redirected to 404 page instead of 403

Hi guys,

We're using Easydiscuss version: 3.2.9422 with Joomla 3.2.3 and Yootheme

We have restricted permission to view posts in certain categories however when someone clicks on a link to view a post that they don't have permission for (e.g. from the Jomsocial activity stream), they are directed to a 404 page error instead of a special Easydiscuss access permission page or a standard 403 page error.

We are receiving lots of complaints because there is no explanation of what has happened and people think our site is broken.

Is there a way to bypass the 404 page error and rather display an explanation of what happened?

Thanks and regards.