I am working on an Excel 2007 workbook within which there are 9 worksheets. In particular, there is 1 worksheet which is giving me trouble. There is a row in which I enter dates. Whenever I enter a date (in the date cell or in fact in any cell), the file crashes for 1 minute before the date appears. If I copy/paste a date into a cell, the file does not crash and the date appears immediately. The crash only happens whenever I enter a date from new. I shall be grateful for any help.