Screen goes black when I try to close a spreadsheet by clicking Red button.

Must Force Quite to clear screen. Is there a fix? Using L.O. V., and OS V.10.12.6

I know you have heard it all before, but it is never really safe to close a document by simply closing the program. It is better to save and close the document before closing the program. That way, if anything goes wrong, you will always be able to recover the last saved version of your document.