LibreOffice not opening
From a terminal(Ctrl-Alt-t):
Create a folder called user in ~/.config/libreoffice/3/.
Then, copy files from /usr/lib/libreoffice/share to
~/.config/libreoffice/3/user/
Finally, change owner group and permissions, then run libreoffice.
Open up a terminal and run the following command:
libreoffice --writer
That way you will get output from the start in your terminal and most likely an error message that gives at least a hint. If you don't see what the problem is right away post the output here.
For other terminal options try "libreoffice --help".