Not sure if this has been mentioned but,
I've created 3 tabs, one that uses a script (vba cmps), the other two are links to other sections of the site.
Firstly when I add vba_index to the script to one tab and go back to the Menu Tabs in the admincp, the other two tabs I had created show vba_index under the script column as well, but checking the tabs that don't have scripts individually theres nothing that shows up in their edit windows.
Second issue, when the Portal tab is selected, the other two tabs I've made (that are just links) also show as "highlighted".
http://dev.teknosounds.com/messageboard/
test user upon request.
Also, you should set the sub menus to be able to choose the CMS, Forum, and Blog tabs in addition to the created ones.