Again: ! TeX capacity exceeded, sorry [save size=500000] (LuaLaTeX, MikTeX)

I’m getting the following error message compiling my PhD-file (used: LuaLaTeX, MikTeX 2.9):

! TeX capacity exceeded, sorry [save size=500000].
<to be read again> 
relax 
l.90    include{M02Part02}
                       
If you really absolutely need more capacity,
you can ask a wizard to enlarge me.



Here is how much of LuaTeX's memory you used:
 44238 strings out of 479059
 125007,2373549 words of node,token memory allocated 3836 words of node memory still in use:
   14 hlist, 3 vlist, 4 rule, 31 disc, 2 local_par, 3 dir, 56 glue, 5 kern, 5 pe
nalty, 4 margin_kern, 277 glyph, 139 attribute, 97 glue_spec, 22 attribute_list,
 1 temp, 7 if_stack, 1 write nodes
   avail lists: 1:7,2:3461,3:167,4:63,5:660,6:73,7:11166,8:2,9:753,10:32,11:1490
,12:1
 62526 multiletter control sequences out of 65536+200000
 83 fonts using 27566143 bytes
 94i,19n,112p,10600b,499999s stack positions out of 5000i,500n,10000p,200000b,500000s
!  ==> Fatal error occurred, no output PDF file produced!

It’s quite impossible (and maybe not even necessary) to give you a MWE, because I’m compiling a dozen of files by the include command. The error occurs since I’m using the reledparpackage to create a translation (latin on the left, german on the right) including some index commands and footnotes. I wonder why TeX is ‘already’ overloaded, because I just wanted to have two or three pages as an output for testing. But, as I read in some other posts, the size of the document as a whole does not cause an error normally. Often, the solution is only: "Use LuaLaTeX!", what I’m already doing!

So… Neither this Problems by enlarging tex memory nor this Compiler error "save size exceeded" nor even this TeX capacity exceeded despite system call LuaLaTeX did work for me. Increasing the memory or the save size didn’t have any consequences. I already have the shell-escape included in TeXstudio, and until the recent usage of the reledpar package, I didn’t have any problems with it.

Please help!

Update
I reduced my files step by step. There was no error with the reledpar package in my opinion, because everything worked fine until I included my (large) bibliography created with biblatex. I suppose that this could overload TeX because I added quite a lot of adaptions of the style. Maybe that there is to find this coding error mentioned in the commentaries.

Update 2
I managed to compile my files in a normal way by putting only the .tex-files in a new folder, open it an compile it.

Update 3 – MWE
I created a MWE in order to see if you get the same errors. Yesterday it worked quite properly. But since today morning, the problem is something with the line numbers, I suppose: Everytime, the compiling is working once, producing a PDF in which the lineation isn’t correct, but index and bibliography are created correctly (in the log: Please rerun LaTeX). During the second run, I get the "save-size" warning. I hope the MWE works. I didn’t reproduce the structure of my document which I’m creating with front-, main- and backmatter, but I included all the options which I consider important for the problem (and its solution, maybe??). I excluded biblatex which is definitely not causing the error, for better overview.

documentclass[paper=a4, twoside=true, usegeometry, fontsize=12pt, parskip=false, 
captions=signature, 
headings=small, headings=optiontoheadandtoc, chapterprefix=true, appendixprefix=true,
numbers=noendperiod, BCOR=0.5mm, DIV=calc, headinclude=true, footinclude=true, pagesize=auto, 
headsepline=0.25pt, footsepline=false, footbotline=0.25pt, plainfootbotline=true, titlepage=true, 
toc=listof, toc=index, toc=bibliography, toc=graduated, listof=chapterentry, nonumberline, 
chapterentrydots=true, sectionentrydos=true, cleardoublepage=empty, open=right]{scrbook}

% Schrift
usepackage{microtype} % Verbesserung des Satzspiegels und des Satzes
usepackage{unicode-math} % lädt auch fontspec mit (Voß Wiss. Arb. S. 30)
usepackage[utf8]{inputenc} % direkt ä, ö etc. von der Tastatur eingeben

usepackage{lipsum}
% Sprache
usepackage[french, italian, english, ngerman]{babel} % ngerman als Hauptsprache
usepackage[autostyle=true, french=guillemets, english=american, german=quotes]{csquotes}

%Index
usepackage[splitindex,xindy]{imakeidx}
% reledpar/reledmac

usepackage[nocritical, noeledsec, noend, noledgroup, series={A}]{reledmac}
usepackage[advancedshiftedpstarts, nomaxlines]{reledpar}
renewcommand*{ledlsnotefontsetup}{raggedlefttiny}% left
renewcommand*{ledrsnotefontsetup}{raggedrighttiny}% right
newcommand{memorybreak}{pausenumberingresumenumbering}

begin{document}
chapter{some chapter}
begin{pages}
begin{Leftside}beginnumberingnumberpstarttrue
pstart[section{Steph. Doletus Gulielmo Scaevae, s.}]
ledouternote{Gryph. 3} Vberrimum ad te scribendi argumentum dum undiquaque colligo, & diutius, quam sperabas, sileo, tuam forte de meo in te amore atque singulari beneuolentia opinionem mirum in modum fallo, neque tardi aut parum diligentis nomen non subeo: sed si qua istiusmodi suspicionem tibi mea tam longa taciturnitateindex{some index} commoui, diligentiam adhibebo, illam ut quam primumfootnoteA{some footnote} deleam.
pendendnumbering
end{Leftside}
begin{Rightside}beginnumbering
numberlinefalse % keine Nummerierung in der Übersetzung
pstart
some translation
pendendnumbering
end{Rightside}
end{pages}
Pages
printindex
end{document}