How is the controlsource for this column set? It should be MyTable.myField If you omit myTable part, you may have this weird effect

>I have a 2 column grid on a form that lists the contact names for a student chosen from a combobox. The grid has a textbox in column1 with the contact name and a checkbox in column2 for selection. The recordsource for the grid is a view that contains all contacts for all students. When a student is chosen from the combobox, the view is filtered on that student.
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>The problem I am encountering, is that sometimes when I go to click the checkbox beside a contact name, it won't let me and a message on the status bar says the control is read-only. This problem is very intermittent.
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>Any thoughts?