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When I compile the following MWE with lualatex or xelatex I get strange vertical spaces between paragraphs on page 2 (see picture of output below). 

\documentclass[a4paper,11pt,parskip=full,twoside]{scrbook}
\usepackage{polyglossia}
\setmainlanguage{english}
\usepackage{blindtext}

\begin{document}

\chapter{Chapter}
\section{Section}
\blindtext
\subsection{Subsection}
\blindtext
\subsection{Subsection}
\blindtext

\blindtext

\blindtext
\subsection{Subsection}
\subsection{Subsection}
\subsection{Subsection}
\subsection{Subsection}
\subsection{Subsection}
\subsection{Subsection}
\subsection{Subsection}
\subsection{Subsection}
\subsection{Subsection}
\subsection{Subsection}
\subsection{Subsection}

\end{document}

The problem does not occur when I remove the parskip option to the \documentclass. I would like to keep the parskip behaviour but I would like to get rid of these ugly spaces.

page 2

Benjamin
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  • I just tried you're MWE in Overleaf and it works normally with both Lua and XeLaTeX. Which TeX distro and OS are you running? – Guilherme Zanotelli Nov 03 '16 at 11:59
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    You will get the same issue without parskip=full if you add some more \subsection commands. There are no page break allowed between sectioning headings followed each other. For a twosided document \flushbottom is active so the space between the paragraphs is stretched to fill the page. This can be changed setting \raggedbottom. Then the additional white space will be at the bottom of the page. – esdd Nov 03 '16 at 12:09
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    presumably your final document will not have a block of consecutive section headings so will not have this problem. Latex never breaks after a section heading so you give it no choice but to stretch the paragraph space as you have specified the last line of the page must be at the bottom, If you add some text here after each heading, then break points will appear and so teh stretching will not be needed. – David Carlisle Nov 03 '16 at 12:35
  • @GuilhermeZ.Santos I have the issue with MiKTeX on Windows and TeXLive on Linux. Do you know what Overleaf is running? – Benjamin Nov 03 '16 at 13:00
  • Ok, are those updated to the latest version? I'm not quite sure which does Overleaf runs and could not find out. I'd expect they have TL 2014 at least... Still I found it funny that it works there but not with your nested distro. – Guilherme Zanotelli Nov 03 '16 at 13:25
  • @GuilhermeZ.Santos The TL should be from 2016 and MiKTeX is an older install but updated regularly. I'm not sure what you meant with "nested distro" but my distro's are on two different machines. Maybe overleaf is using a heuristic for rendering the output to reduce server load? – Benjamin Nov 03 '16 at 13:42
  • @GuilhermeZ.Santos If you add the twoside option to \documentclass in Overleaf the behaviour described by me occurs. – Benjamin Nov 03 '16 at 15:41
  • @Benjamin, indeed it does! I also ran in my PC (win 10 with TL 2015) now and it seems to work normally and the problem also appears after adding the twoside option. Perhaps you should add that to the MWE to make the issue reproducible. And for the record: I have no idea how Overleaf does its compilation, the only information I found is that it uses latexmk – Guilherme Zanotelli Nov 03 '16 at 16:38
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    @GuilhermeZ.Santos the standard classes use \flushbottom in twoside – David Carlisle Nov 03 '16 at 16:43
  • There was a little bug in KOMA-Script versions 3.17 - 3.19a: Using one of these version option twoside is implicitly set for scrbook but \raggedbottom is still active. This was fixed in version 3.20 and current version is 3.16. AFAIK Overleaf uses version 3.19a – esdd Nov 03 '16 at 16:50

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