WP Clean-fix totally messed up my sites and now I can't post anything. The theme pulls from the category number and now that disappeared and I have to start from scratch. This problem did not become apparent until I wanted to post something new, so I was confident the plugin had worked and had not messed up anything.
Use this as a warning for non expert users.
Hopefully somebody from the plugin will see this and tell me if there is a way to fix it.
I am in the process of starting one of the sites from scratch, and the others (5 more) are surviving but I cannot add anything to them, so I will have to redo them all too if I don't get help from the plugin creators.
Most messed up site: http://yourgamesuniverse.com