I've been experimenting with WriteLaTex and, while it seems to do a very nice job overall and has the best user experience of the alternatives I have tried, my experimental document stopped after 30 pages. This does not happen on shareLaTeX, latexlab or in my offline compiles of the same document on the Mac or the PC. This led me to wonder whether a 30-page limit is built-in to WriteLatex? I expect the example document to have a length of 34 pages.
As an aside, I also tried SpanDex but had other difficulties with it. By-and-large, I would like to stick with WriteLaTeX because, as I mentioned, its user experience seems the best to me.