grid lines white
The last update destroyed the grid lines. Automatic color for grid lines in active sheet is alway white. I have to change it to grey in every document!
We didn’t make any changes to gridlines, so probably what happened is that they got inadvertently set to white on your machine. To change them to the default (for all new workbooks):
1. Start Excel
2. Go to Excel > Preferences > View > Show in workbook
3. Make sure that “Gridlines” is checked, and that the drop down there is set to “Automatic”
Hope that helps. In the future, a better pace for this type of question is the answers.microsoft.com site (you can post in the Mac Excel area)