Can no longer save as from XLSM to XLSX

Copper Contributor

Today I tried to save an existing XLSM file as an XLSX file and it will do nothing. It looks like the popup window that should warn me is not working any longer. We did a windows update yesterday would that have affected Excel in any way?  I literally can no longer change the extension unless I delete all of the code so the warning doesn't need to appear. I can however run a script to disable the warnings, and save the file as an XLSX. Still a huge pain to not be able to just save as when I want to. Please help!

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