I’ve got a problem with formulas in Polish version of LibreOffice Calc version 18.104.22.168 (Windows 7 Professional, SP1, 64-bit). In one of my sheets I created formulas which include references to the other sheet, then I saved the file and closed it. When I opened the file again, all formulas (which had references to the other sheets) were broken. It’s interesting that formulas work correct when they include references to the same sheet where they were created. I hope that I made myself clear. Sorry for my poor grammar.