can't edit node with category and cck-field

I have assigned a category to my blog-node which is required. If I want to edit an entry in bloglist, only the text field appears and when I save the entry I get the announcement that the category is necessary.

In addition, I created an own node-type with cck-fiels which is also assigned to a category. In the nodes-list to a term, the edit-button appears to each node, but when I want to edit there is no field in the form which I can edit.

Thanks if you can help!