The View Item dialog on one of my lists is displaying a field that I need to hide. The field is not included in any of the views, and Manage Content Type is enabled on the list, but the option to hide the field in question is grayed out under Column Settings in Change Content Type Column. I have successfully hidden several other fields in this list. The only difference between those fields and the problem field is that the latter is a calculated field. Does anybody know what the problem might be?