And if you are in the file explorer and you right-click on a file, do you see a window starting with rename like this: 
Try also to download a new version of Obsidian, 0.92 and overwrite your older version. You may have an install that is too old.
And if you are in the file explorer and you right-click on a file, do you see a window starting with rename like this:
Try also to download a new version of Obsidian, 0.92 and overwrite your older version. You may have an install that is too old.