[support] CCK Field Not Showing Up on Admin Pages

A CCK field isn't showing up at: /admin/content/types/resource/fields (where "resource" is the name of the content type where I've put the field). The field does show up properly at: /node/add/resource It also displays properly when a node is viewed. The problem field is a text field which uses a select list. I discovered the problem because I want to add some choices to the select list. Weird. Ideas? Shai