Hi,
If it is not a merged cell problem then I can tell you that I have had this
problem on a number of occations. Really only one cell was selected but it
looked as though two or more were. It definitely is a bug, probably
something to do with screen refresh or display. One solution I found was to
toggle to another program and then toggle back, sometimes that worked.
Sometimes I had to restart Excel.
If any of this helps, please click the Yes button.