Grids are commonly initialized in a form's AfterOpen event. If a grid is unconditionally initialized in a form's AfterOpen event, however, the grid's data will be overwritten whenever a saved session is reopened. Unconditional initialization looks something like this:  

Dim dt As New DataTable()
' Add some columns to the DataTable
_Grid.Value = dt


To maintain grid data when an existing session is revisited, add a conditional check:

If (_Grid.Value Is Nothing) Then
	' do initialization here
End If


If this pattern is not the source of your issue, contact Mi-Co Technical Support.