Hi, since I changed from PC to Mac a week ago, our team cannot view Web Parts on our Sharepoint Online homepage which are based on Excel files which I have saved using Office for Mac 2011. If I switch back to my PC and re-save the files using that/Office 2013, the Web Part works again.
Office for Mac is set to save files as an "Excel Workbook (.xlsx)".
The error message is:
We're sorry, we couldn't open your workbook.
It's possibly corrupt or using a file format that's not supported.