Product Categories links don’t work right – e-commerce

I just upgraded to 2.8.4 WP today, hoping that my problem would be fixed, and it is not.
On my website, doodlepalace.com, I sell digital stamps. The product category widget on the sidebar shows the correct number of items per category, but if you click on a specific category, the page only seems to refresh (or goes directly to product home page) and shows all the items available for sale instead of those select few. Also, when I add new products, I can’t add new tags.
Can anyone help with this????? Need to fix ASAP!!!!!
Customers count on it!