I have used the following formula =AND(NOT(ISBLANK($A4)), ISBLANK($E4)blank. to conditionally format a blank cell, when a neighboring cell is not blank. It works as expected, however when I have tried to use the same formula on another sheet, the reverse happens. AR highlights instead of e4. A4 haS a name, & cell E4 has a date on the new sheet. any suggestions?