Grids; column is removed if used in a "group by" when the form is re-opened

A grid column is removed if used in a "group by" when the form is re-opened.

This occurs if you have the setting "Save Grid layouts when Form is closed?" checked under Tools, User Preferences group, User Interface page.

To recreate.

• Right-click grid and click "Show Group By Box"
• Drag a column to the group by area
• The column is removed from the grid
• Close and re-open the form

At this point the column is no longer shown, and since group by columns are not preserved it is no longer in the group by.