Why shuts librewriter down when I have marked some text and press right mousebutton?

Writer.
Have Linux Cinnamon 17 and Libre office 4.2.3.3 in Swedish

The answer to “why does it shut down…,” appears to only be possible if the source code is analyzed.

I would try to reset my user profile (details are here: https://wiki.documentfoundation.org/UserProfile) and if this does not solve the problem, I propose to file a bug report here: https://www.libreoffice.org/get-help/bug/