When I upgraded from VB 3.0.1 to 3.0.6 I lost the dropdown menu for VBindex options in my admincp. I spent an hour looking for the answer here and elsewhere -- before figuring it out. No no one else has to feel my pain -- the answer is:
in the admincp at line 568 replace
PHP Code:
construct_nav_option($vbphrase['vbulletin_options'], 'options.php?null=0', '<br />');
with
PHP Code:
construct_nav_option($vbphrase['vbulletin_options'], 'options.php?null=0', '<br />');
construct_nav_option($vbphrase['vbindex_options'], 'vbioptions.php?', '<br />');