Not all taxonomy vocabulary are showing up on Vocabulary Index page

You do have a typo in vocabindex.install -- missing line break between comment and drupal_uninstall_schema, which leaves the vocabindex table. But the module still is not picking up all of the vocabulary items. And these are being returned by the call to taxonomy_get_vocabularies, but they're not showing up in the vocabindex table after the plug-in is enabled.

I found the problem. In vocabindex.install you have:

$vocs = taxonomy_get_vocabularies();
// Beware, the first VID is 1, not 0
for ($i = 1, $len_i = count($vocs); $i <= $len_i; $i++) {
vocabindex_create($vocs[$i]->vid);
}

However, the taxonomy items aren't always ordered. If taxonomy items have been deleted, or new ones added, the sequence of vocabulary indexes will not be sequential. You're assuming sequential.

If you replace the for loop with the following, installation works:

foreach ($vocs as $voc) {
vocabindex_create($voc->vid);
}

I don't know how to do Drupal module patches or would submit a patch.

No, this seems to be a different issue. That thread is discussing items being added via an application. Mine isn't related to the thing called ubercart.

Looks like someone has already. Glad to worked with both situations.

Thanks for the link to info on how to do Drupal patches.