I've got the same problem here and in addition I've noticed that there are a dozen copies of the controls that make up the grid in the Designer.Vb / Resx files.  The grid control seems to be orphaning the grid sub-controls and recreating with a new sequence number during some undetermined development event.  Only the unbound columns are ...

We use a Grid of about 40 columns and 250 rows. 10 of them are of type DateTime? at the right end of the grid. When we scroll to the right the grid the grid takes more time to refresh it's state.  Same behaviour, if we use the up and down arrow to navigate between the rows.  If I change the datatype of the DateTime? columns to string ...

I have a project which dynamically generates a grid and populates it with a DataSource (using LINQ to SQL) and returns it to another process which then places that on a form. It appears from my testing that the Columns collection is not accessible unless the Grid has been associated with a Form prior to the DataSource being assigned as I am ...