I am having the same issues. After many googles, found out it is caused by the vbaProject.bin. But, I am not sure how to fix the vbaProject.bin file. I discovered a way to fix it that works for me. First, export codes from forms, modules, and sheets from the problemed xlsm file. Save the xlsm as an xlsx without macros. Open the saved xlsx file and import all exported forms, modules, and sheets back to the file. Resave the file to be an xlsm. Hope this will also work for you.