I don't know how to do this whole bug-reporting shebang, but I thought I might contribute since I saw only one other person reporting this bug, even though I'm running Ubuntu.
In LibreOffice Writer, when I click "More styles..." from the Apply styles dropdown menu or go through format -> styles and formatting, Xorg immediately crashes and drops me back out to the login menu.
I hoped to provide some information from my xorg log, but it seems like it began anew following the crash. The old one ended with the following:
[ 78951.870] (EE) EXA: malloc failed for size -11269152 bytes
But it's not clear to me if that's related or even from the same date.
Anyway, I don't know what information to provide, I just didn't want the other guy to feel like he'd dreamt it up.
Danielle McCool