As suggested by this thread
, this plugin lets you set a "home category" for each group (besides the administrator & banned groups). Once you set a home category, the "Home" links in the system menu and breadcrumb will be replaced with links to this category.
I'm pretty sure it works in all cases & configurations, but treat it with caution. Since it messes with the 'page_html' filter, it could make your site go blank (it did during some of my intermediate tests which were subsequently addressed). If this happens, go to your database (using a tool like phpMyAdmin) and empty out the cpg_plugins table or just delete the single reference to this plugin. Then refresh your page. Please report any serious issues.
Since users can belong to more than one group, the way this plugin chooses which home category to use is that it looks at the secondary groups to which a user belongs. If there is only one secondary group, it chooses that home category setting. If there is more than one secondary group, it chooses the primary group home category (which for most galleries is "Registered" - you can change the primary group, but if your gallery depends upon a "Registered" group, you might get stuck - a user cannot belong to "Registered" as a secondary group).