Many people in the company are experiencing the odd screen refresh problem where data is entered and the screen doesn't refresh to show the updated result in corresponding cell formulas.
Microsoft have issued a hotfix to fix the issue for Excel 2003 as shown. Microsoft released a hotfix for this problem (<a href="advisory?ID=978908">KB978908</a>). Display memory tends to pick up data from hidden sheets and pastes it into the active screen. No impact on the file. This occurs when protecting and unprotecting worksheets in VBA. I also suspect that enabling and disabling screen refresh contributes to this problem. In any case there is a fix, albeit with the following disclaimer:
As of yet I have not been able to find a fix for this for office 2010 and 2013, Any suggestions would be great.