View tabs with multiple parents / children not working

I think there is a bug related to menus with two levels. For example:

Menu Tab Parent 1
[sub a:default:/front/parent1/a][sub b:/front/parent1/b]

Menu Tab Parent 2
[sub a:default:/front/parent2/a][sub b:/front/parent2/b]

The "Menu Tab Parents" are all horizontal. So they share a common root path: /front. I can get this to work fine if "Menu Tab Parent 1" does not have any sub menus, just a single path. But as soon as I try to have the leftmost Parent tab have more than one sub menu, doesn't work. I can validate that the instructions above do work, just not for multi-level parents. I'm not try to go beyond the parent/child or two levels per the docs.

I've read all the docs and posts related to this. Any help is appreciated if there's a way that I missed. I think it's a bug.

Using latest version of Drupal and Views2. PHP5.

Thanks.