The word "LibreOffice" isn't in the dictionary by default, and it's underlined as if misspelled.
This happens in both Writer and Calc, but I can't select more than one component in Bugzilla.
Could you please retry using LO 184.108.40.206? http://www.libreoffice.org/download/pre-releases/
Using 220.127.116.11 with german language and typing LibreOffice the word does not get underlined. Other test words I mistyped on purpose did get underlined.
18.104.22.168 in english also does not underline the word LibreOffice.
Seems this already was added somewhere on the way.