[support] Role unable to post a content type

I have a drupal5 site with taxonomy access installed. I have created some custom content types and a couple of administrative roles (one to manage content and another to manage content, taxonomy, blocks, etc...).

Now a user of "role1" is able to post contenttype1 but unable to post contenttype2 If I add user to "role2" he is able to post contenttype1 and contenttype2

I tried checking all permissions in "Access Control" for role1 with no result, and also doing the same in all taxonomy access control for role2 with no results.

How can I guess which module is blocking create permission to role1?

Thanks.