Brand new install of 6.4.0 on Macintosh OS X 10.15.3. Start the app, click to make a new calc spreadsheet. Type in a few formulas and numbers. Click Save As and get a spinning beach ball. That goes away after a moment. Document was never saved. Same behavior from clicking Save, Export, or Quit and then Save.
Steps to Reproduce:
1.Make new calc sheet
2.Enter a few numbers and formulas
Spinning beach ball cursor. Goes away after a moment. Document not saved.
It should have prompted for a file name and saved the document.
User Profile Reset: Yes
*** This bug has been marked as a duplicate of bug 126638 ***