Libreoffice Calc works on one computer but not another

I’ve used Libreoffice for several years in exactly the same way. I put the file I’m using in Dropbox and then can access it from two different Windows 10 machines. Worked well for years, but the past week or so I have had trouble on only one of the machines. It won’t calculate the formulas as usual. It will do it once (sometimes incorrectly) then just freeze. I can change and add data to the sheet but it will not do any calculations. Any ideas of what I’m doing wrong?

Can anyone tell answer this too? Is it a setting that can be fixed?

Dropbox Fix Sync Issues might be first place to look

Dropbox Fix Sync Issues might be first place to look. Cheers, Al