If I remove just one of the menu links from the list, the module does not show. Thoughts? Is it because of the list id? Could it be because the module is listed on a hidden menu? The menu is published, but in a position that is not viewable.
The only factory in determining module display is Itemid. In order for your userlists to have Itemids you need to create Joomla menu links to those lists. Once done you'll need to configure your modules to display on that menu link. The above depends on what Itemid CB and Joomls is giving you when navigating to your list. Please review the URL to ensure the menu link you set the module to display on matches the list you're viewing.
Also....is it possible to use a video plugin to publish a video in the description portion of the user list? (this option does not seem to be working)
CB has no video plugin. You can display a video using delimiter fields if you like.
Can I add a module above the user list? (this option does not seem to be working)
CB has absolutely nothing to do with modules. If your template supports a module position above the component content area then yes you could do this otherwise, no.