I was playing around with filters (displaying different colors in cells based upon their values), and something I did corrupted the worksheet. There is a lone cell (in the column in which I was doing the filtering) which does not let me modify it, nor can I delete the row in which it is located. It seems to think the cell is now a header cell based upon error messages I am receiving (it is in row 5). I have tried removing protections, removing filters, etc., but that cell absolutely cannot be modified or deleted. Any ideas? I can send the spreadsheet to someone if necessary; it's not all that big.