The most common reasons for add-ons not displaying is the root category being disabled. To check this navigate:

Products > Products > Website Products

Then in the list of categories to the left side of the page simply make sure the very top one called "Categories" is checked to be active. It should look similar to this:


If this is checked and your add-ons are still not showing please contact us at 415-906-2850 ext 2 or at