I'm facing the weirdest issue and have spent hours googling a solution but returned empty-handed. I have a Mac early 2015 laptop with OS X Sierra(10.12.5) installed on it. Whenever I try to save a word/ppt/xls/txt file with Word/Powerpoint/Excel/TextEdit, the dialog box doesn't show up. There's no confirmation of whether it's been saved or not and I have lost hours of work because of this issue. Has anyone here faced this issue before?