CheckedListBox - checkboxes not drawing on load

When I load my form the check boxes on a CheckedListBox don't draw (only on the computer that the app should run on)

Moving the form slightly seems to cause them to draw.    Me.Location= New Drawing.Point(Me.Location.X + 1, Me.Location.Y) will force them to draw. 

Refresh, Invalidate don't do anything

Anyone have any suggestions/thoughts?

Thanks,

Gary