I normally use LaTeX, but currently I'm collaborating with a couple of people who don't, so I'm forced to use LibreOffice (v. 22.214.171.124 running on Ubuntu 12.04 LTS). I'm saving the file as .docx so that it goes well with my colleagues' Windows machines, but this seems to create problems with my Linux machine. Specifically, closing and reopening the file causes several page breaks to appear randomly through the document. I can save a 28-page document in the evening, and when I open it again in the morning it has blown up to anywhere between 40 and 50 because of those page breaks. The long term solution, obviously, is to refuse to collaborate with someone that doesn't want to use TeX (or at least Markdown or something that is just plain ASCII). For the very short term, I just need to understand why LibreOffice insists on inserting these page breaks and how to stop it from doing so.
[minor rant: in the past, I worked with a Windows machine and would use Word for collaborations like this. Say what you want about Microsoft and Word, but at least Word was able to keep the document formatting between close-open cycles]