Make sure only one person at a time is accessing the Attribute Manager application.  Attribute Manager is intended and licensed for access by only one user at a time.  If more than one user is making changes simultaneously, changes you make could be overwritten by someone else.

If none of the items in a category are web-enabled, then the category won't show on the website at all.  If some items in the category are not web-enabled, the category will show on the website, but those items will not be in the category (or on the site).

After making changes in Attribute Manager, you will need to click the "Export Data to File" button on the "Export Data" tab.  Changes to categories or items in categories will not appear on the website until you perform the export.  This export tells the system about the new data to show on the website.

If the items in the category are web-enabled and you have exported the data, wait for the next data update to your site or manually request an update.  The site won't have access to any of the changes from your exported data until your next scheduled data update runs.  These generally run every 4 hours.

If you have checked all of the above possibilities, and your additions or changes to categories are still not showing up on the site, please feel free to contact Aldrich Web Solutions.