Quote Originally Posted by johnnylazerball View Post
I am using multisite and simple SEO all works great except I get this every once in awhile

/categories_name-c-0/products-name-p-18

and of course the page says "Sorry, the product was not found."

How do I fix it?
Meaning you are using easypoplulate version that messes up the master category id. You can reset master category id via store manager in the admin I believe. Be careful if you are also using linked products though.