I am atempting to install a few new modules to a Drupal 6.20 site running on Apache 2.3.2 on Linux (CentOS) installed from an installation profile in "/var/www/html/commons/drupal_commons/profiles/drupal_commons". I have tried extracting the new modules to "/var/www/html/commons/drupal_commons/profiles/drupal_commons/modules/contrib/" as well as "/var/www/html/commons/drupal_commons/sites/all/modules" and "/var/www/html/commons/drupal_commons/sites/home-dev.example.org/drupal_commons/modules".

The new modules never show up on the "Site Building --> Modules --> List" page after gracefully restarting Apache and even after completely killing all the httpd processes and restarting Apache. I have flushed the Drupal caches, checked the file and directory permissions -- myaccount/webdevs/others: 775 -- on the new module files/directories, and there are no screwy entries in either the Drupal logs or the Apache logs.

I'm not really a Drupal newbie, but most of my experience is on Drupal 5. Can anyone see something really dumb I'm missing about installing a new module under Drupal 6?
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Thanks,

Glenn