banner doesn't show in combination with category module

I'm working on a somewhat large installation of Drupal, currently located at http://137.120.119.30/nvon (waiting for deployment on www.nvon.nl). We've implemented category module for content organization with taxonomy_wrapper for access control. There are some 10 containers, each holding some 10 categories. I've switched back to a modified earlier version of category module since the active versions still suffers from critical bugs.
I've installed banner module afterwards and noticed it automatically created blocks for every container and category. However it did not create a new category for the banner content type. Therefore I manually created a new container (node=449) & category (node=450) and related the banner (node=45) to the category. This automatically created two new blocks for the container and category. I've selected the block with ID=450 and put it in the right column. I've added print banner_display(450); in the template. However, the banner doesn't show. The node can be viewed by anonymous and authenticated, so the ACL-settings must be correct.
Has anybody succesfully combined category with banner? Is the behaviour of generating blocks for every term correct? If so I should probably dig in deeper on our modifications of category module.

Help appreciated, thanks for reading this anyway.
eric