I am using a MS Excel workbook presently that is giving me fits over the "Funtions" either not working at all or working incorrectly. I have checked the formating of the cells in use and they are all formatted the same, for "numbers" no decimals. I have re-started my computer, which didn't seem to help. I am presently trying to use the "countif" function in a column, to count the days of the month that have been reached. The "countif" function doesn't count all of the cells that it should. I have just learned that I can go back and delete each cell that is to be counted and then re-enter the number, and the "countif" functions starts working again. Is there something that I have done wrong in the beginning to cause this? I am using MS Excel 2000 with Windows 98SE.