save and auto-save are not working after upgrade to 7.1.2.2. If I exit calc, I am asked to save the spreadsheet. It works if I click on save there. But if I choose File->Save or clock on the save icon, nothing appears to happen. The save icon always has a red dot, which indicates nothing was saved.
Update: I found that changes are saved when I click the Save icon. But it still shows the red dot to indicate the file was not saved. So this is less of a problem. It actually is saving my changes. But it says that it is not.
Try changing your icon style to another style, apply it and then change back to your original icon style and apply that. I think I noticed something similar at one stage but I was playing with UI and Icons so it disappeared pretty quickly and I can’t be sure what actually happened.
Click Tools > Options > LibreOffice > View and change the icon style (top field) to another, click Apply and wait for changes to be applied. Change back to original style and click OK.