If you're using datasheet view, you have to set the ColumnHidden property. I think it has to be in code, but I don't like datasheet view and don't use it, so I'm not sure.
No -- not using datasheet view. Form is viewed in form view. Worked on in design view. The property sheet says "NO" next to datasheet view.
Then setting the Visible property of the control should hide it. Can you post the db here?