>Naomi --
>
>All my grids have a "create" method which re-creates the underlying grid, sets the recordsource, deletes any existing columns, and then adds the columns that are necessary.
>
>I have many cases where the columns to be displayed are dependent on various user-enter parameters, so I have found it most convenient to always handle grids this same way.
>
>BTW, this problems occurs the first time I activate a page, so that's not an issue here.
>
When you specify column's controlsource, did you specify it as TableName.FieldName as opposed to just FieldName?

Also just for the test, would it be possible for you to try to create a copy of this form with grids defined in design-time and see if the problem persists?

Do you have unmatched LockScreen somewhere?