DataGridView reordering in design view

Hi folks,

I'm developing an desktop app that uses a DataGridView. This is bound to
a BindingSource derived from an object. I have just added a couple of
public properties to the class and added these columns to the DGV. They
display just fine and as I expect at runtime, but whenever I view the
form in design view the columns are reordered. However, they still
display correctly at runtime. Only if I Edit Columns on the DataGridView
and then Ok that dialog does the reordering affect the runtime view.

Any ideas/similar experiences. For now I have locked the controls on the
form which is making it behave for the moment, but if I need to change
the form in any way I need to unlock it and again the same problem at
design time.

Oh this has only just started happening, was working fine for the last
two weeks.

Cheers

Simon