How can I stop Writer from always loading the last opened file?

I’m on Ubuntu 14.04. When I start writer it loads the thesis I’m working on but calls it “Unnamed 1”. When I close it and reopen writer it loads the same document. When I click on “new document” it opens the same document now called “Unnamed 2”. When I try to delete the content of the document it says it’s write-protected. Reboot didn’t help.

Does the answer here help?