Can't get tac_lite menu to show in admin area

I've disabled all modules on my site apart from code modules and tac_lite.

Regardless of this, I can't get the tac_lite menu to show up. This is similar to the issue posted here.

I struck this problem as you can see in that post, but my suggested fix doesn't work now I'm using 6.x.

When I click on "Access Control" in my Admin area, I see the following list of options:

* Access control
* Access rules
* Permissions
* Profiles
* Roles
* User settings
* Users

If I manually add tac_lite to the end of the admin/user/access URL, I can access all of the tac_lite settings fine.

I have tried everything I can think of, short of nuking my DB and starting over. Can anyone post any suggestions as to what the problem might be?

I am using the latest 6.10 of Drupal and the latest 1.3 version of tac_lite.

tac_lite is working fine, there's no problem there. I just can't figure out why I have to manually access the URL to manage it. Any pointers would be appreciated.

Many Thanks,

Tim