A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data.
Thanks for your quick reply, Vijay. No luck though.
Problem: No grid, icons in ribbon are grey, etc. The only files that open normally are those previously created with Excel 2013 or that I had opened a week ago or and converted when closing. I installed Office 2013 about two weeks ago.
Option 1: No files in folder XLSTART
Option 2: There were three xlb files: Excel12.xlb, Excel14.xlb, Excel15.xlb. At first I just changed the extension for 15 and opened Excel, which created a new file. Then I tried to open one of the files that is giving me trouble. Same problem. Then I changed the extensions of all 3 files. No improvement. Then I removed ALL xlb files. No change.
Option 3: Not relevant.
Option 4: I disabled the only 2 non-native Excel Add-ins, one at a time: Omni Page, and Send to Bluetooth. No change.
Option 5: This link refers to older versions of Excel. Some suggestions are not relevant. Others did not help.
Option 6: Not relevant.
Option 7: No help.
What next?