# Citation not shown in pdf [closed]

I have some troubles with citations and biber. I'm citing a paper several times and point to different sections in that paper. But sometimes the citation is not shown in the pdf. I can't comprehend when they are not shown. In one section they are shown properly, and in the other section simply a space appears.

First I use

\cite{Shani2011}


and the second time I use the same (copy and paste)

\cite{Shani2011}


Inside the Bib reference, the paper is also shown properly. I got no errors in my console, just a few Overfull \hbox... and !h float specifier changed to !ht warnings, and one No backend specified, using Biber backend. I don't know why this biber warning occurs, my command to compile in texmaker is (% references the current document name):

"/usr/texbin/pdflatex" -synctex=1 -interaction=nonstopmode %.tex|
"/usr/texbin/biber" %|
"/usr/texbin/pdflatex" -synctex=1 -interaction=nonstopmode %.tex|
"/usr/texbin/pdflatex" -synctex=1 -interaction=nonstopmode %.tex|
open %.pdf


Does anyone know where I can start to debug this?

==========================================

EDIT

Ok, here is a minimum example:

\documentclass[12pt,a4paper]{article}
\usepackage[english,ngerman]{babel}
\usepackage[authordate]{biblatex-chicago}

\bibliography{Bibliography2}

\begin{document}
\cite{Shani2011} blabla. \cite{Shani2011} blabla
\end{document}


This produces

Shani und Gunawardana 2011 blabla.  blabla


The second citation doesn't gets printed into the pdf. But I found out, if I cite between the two Shani2011 another paper, it works. This

\begin{document}
\cite{Shani2011} blabla. \cite{Shani2009} blabla \cite{Shani2011} blabla
\end{document}


produces this

Shani und Gunawardana 2011 blabla. Shani 2009 blabla Shani und Gun- awardana 2011 blabla


So I don't know why this doesn't work. Any ideas?

EDIT

Here is the Bibliography2.bib:

@article{Shani2011,
author = {Shani, Guy and Gunawardana, Asela},
title = {{Evaluating recommendation systems}},
year = {2011}
}

@article{Shani2009,
author = {Shani},
title = {{Evaluating recommendation systems}},
year = {2011}
}


EDIT

Here is the content of the Masterthsis.blg:

[1] Config.pm:361> INFO - This is Biber 1.5
[302] Config.pm:364> INFO - Logfile is 'Masterthesis.blg'
[1209] biber-darwin:193> INFO - === Tue Mar  5, 2013, 10:19:55
[1210] Biber.pm:327> INFO - Reading 'Masterthesis.bcf'
[1426] Biber.pm:619> INFO - Found 1 citekeys in bib section 0
[1841] Biber.pm:2976> INFO - Processing section 0
[2305] Biber.pm:3086> INFO - Looking for bibtex format file 'Bibliography2.bib' for section 0
[2449] bibtex.pm:764> INFO - Found BibTeX data source 'Bibliography2.bib'
[4823] Biber.pm:2860> INFO - Overriding locale 'en_US.UTF-8' default tailoring 'level = 4' with 'level = 2'
[4823] Biber.pm:2860> INFO - Overriding locale 'en_US.UTF-8' default tailoring 'variable = shifted' with 'variable = non-ignorable'
[4823] Biber.pm:2866> INFO - Sorting 'entry' list 'nyt' keys
[4824] Biber.pm:2870> INFO - No sort tailoring available for locale 'en_US.UTF-8'
[5115] bbl.pm:462> INFO - Writing 'Masterthesis.bbl' with encoding 'ascii'
[5116] bbl.pm:535> INFO - Output to Masterthesis.bbl

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## closed as too localized by egreg, lockstep, Martin Schröder, mafp, diabonasMar 5 '13 at 13:56

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Please provide us with a minimal working example (MWE). Take a look at minimalbeispiel.de/mini-en.html if you are in doubt. – aagaard Mar 2 '13 at 16:36
The "Biber backend" warning is normal if you don't specify a backend= argument when loading biblatex. It's there since version 2.0 because before that, bibtex was the default backend. You can ignore it or just add backend=biber as an option when you load biblatex. – PLK Mar 2 '13 at 22:11
Thx for your comments, I added a minimal working example. Hope this helps. – 23tux Mar 4 '13 at 18:59
I have no problem with your example - it shows both citations. I suspect it's something to do with an outdated biblatex-chicago style (I suspect it's a style issue anyway - not biber related). – PLK Mar 5 '13 at 11:00
and now i found the solution to the question! according to the biblatex-chicago documentation tug.org/texlive//Contents/live/texmf-dist/doc/latex/… the option noibid disables this behaviour and all citations are fully displayed. use it like this: \usepackage[noibid]{biblatex-chicago} Please reopen the question so i can post this as answer. – Dominik Apr 13 '13 at 8:13