I have a spreadsheet with numerous formulas all have been working properly till two days ago. One cell with a formula just stopped displaying the results out a the blue! I tried re-entering the formula, checked to make sure the text color didn't match the background color, rechecked the formatting as currency, verified no conditional format, verified I hadn't hidden the cell some how but found nothing different. The c ell will show text when typed just no formula in that cell or any other cells on the page! The remaining cells that do have formula's are still showing results, I just can't type any formulas in any other cells that didn't already have data.

Anyone have a idea what has happened here?