If you are trying to update your categories and slugs, and the error “Item Not Updated” comes up, there is only one reason why. You are trying to give a category slug the same exact title and format as one of your existing post tags. Category slugs cannot be the phrase as any of your tags for posts. For example, if you have a tag called,

tech-tips-microsoft

You’ll need to make a category slug like this instead,

microsoft-tech-tips

Just change your words around a bit and you’ll get around the mysterious “Item Not Updated” error on WordPress with ease. I am thinking they will add a note along with that error some day which actually explains why it’s denying your changes.