# Edit:

As per moewe's suggestion, the MWE is now truly minimal (I think). I removed the need for multiple .bib files by removing abbreviations, and made the main .bib file smaller (exactly as shown below).

Here's the log (file.blg):

[0] Config.pm:318> INFO - This is Biber 1.8
[0] Config.pm:321> INFO - Logfile is 'file.blg'
[60] biber-darwin:275> INFO - === Sat May 10, 2014, 14:45:31
[61] Biber.pm:333> INFO - Reading 'file.bcf'
[128] Biber.pm:630> INFO - Found 2 citekeys in bib section 0
[156] Biber.pm:3053> INFO - Processing section 0
[181] Biber.pm:3190> INFO - Looking for bibtex format file 'https://dl.dropboxusercontent.com/u/47261882/bibliography.bib' for section 0
[182] bibtex.pm:134> INFO - Data source 'https://dl.dropboxusercontent.com/u/47261882/bibliography.bib' is a remote BibTeX data source - fetching ...
[925] bibtex.pm:812> INFO - Found BibTeX data source '/var/folders/lw/xmh_g5vx4j9ctfxysb189qyr0000gn/T/ZegiE_xxWe/biber_remote_data_source_vqdu_.bib'
[930] bibtex.pm:134> INFO - Data source 'https://dl.dropboxusercontent.com/u/47261882/bibliography.bib' is a remote BibTeX data source - fetching ...
[1508] bibtex.pm:812> INFO - Found BibTeX data source '/var/folders/lw/xmh_g5vx4j9ctfxysb189qyr0000gn/T/ZegiE_xxWe/biber_remote_data_source_17lZd.bib'
[1509] Utils.pm:169> WARN - Duplicate entry key: 'a:watson:2014:01' in file '/var/folders/lw/xmh_g5vx4j9ctfxysb189qyr0000gn/T/ZegiE_xxWe/biber_remote_data_source_17lZd.bib', skipping ...
[1509] Utils.pm:169> WARN - Duplicate entry key: 'ic:bedau:2009:01' in file '/var/folders/lw/xmh_g5vx4j9ctfxysb189qyr0000gn/T/ZegiE_xxWe/biber_remote_data_source_17lZd.bib', skipping ...
[1509] Utils.pm:169> WARN - Duplicate entry key: 'c:barberousse:2009:01' in file '/var/folders/lw/xmh_g5vx4j9ctfxysb189qyr0000gn/T/ZegiE_xxWe/biber_remote_data_source_17lZd.bib', skipping ...
[1510] Utils.pm:169> WARN - I didn't find a database entry for crossref 'c:barberousse:2009:01' in entry 'ic:bedau:2009:01' - ignoring (section 0)
[1535] Biber.pm:2939> INFO - Overriding locale 'en_GB.UTF-8' default tailoring 'variable = shifted' with 'variable = non-ignorable'
[1535] Biber.pm:2945> INFO - Sorting 'entry' list 'nty' keys
[1535] Biber.pm:2949> INFO - No sort tailoring available for locale 'en_GB.UTF-8'
[1539] bbl.pm:482> INFO - Writing 'file.bbl' with encoding 'ascii'
[1540] bbl.pm:555> INFO - Output to file.bbl
[1540] Biber.pm:105> INFO - WARNINGS: 4


It seems like the file is fetched twice (hence the warnings for duplicate keys). But I do not know how this is related to the issue.

When using biblatex's (and biber's) feature for fetching .bib files from remote locations, cross-refs are not resolved.

Consider the following bibliography file (bibliography.bib):

@Article{a:watson:2014:01,
title           = {The Evolution of Phenotypic Correlations and Developmental Memory''},
author          = {Watson, Richard A. and Wagner, G{\"u}nter P. and Pavlicev, Mihaela and Weinreich, Daniel M. and Mills, Rob},
journal         = {Evolution},
year            = {2014},
month           = apr,
volume          = {68},
number          = {4},
pages           = {1124--1138},
doi             = {10.1111/evo.12337},
url             = {http://dx.doi.org/10.1111/evo.12337},
}

@InCollection{ic:bedau:2009:01,
title           = {The Evolution of Complexity},
author          = {Bedau, Mark A.},
pages           = {111--130},
doi             = {10.1007/978-1-4020-9636-5_8},
url             = {http://dx.doi.org/10.1007/978-1-4020-9636-5_8},
crossref        = {c:barberousse:2009:01},
}

@Collection{c:barberousse:2009:01,
editor          = {Barberousse, Anouk and Morange, Michel and Pradeu, Thomas},
title           = {Mapping the Future of Biology},
booktitle       = {Mapping the Future of Biology},
subtitle        = {Evolving Concepts and Theories},
publisher       = {Springer Netherlands},
year            = {2009},
doi             = {10.1007/978-1-4020-9636-5},
url             = {http://dx.doi.org/10.1007/978-1-4020-9636-5},
series          = {Boston Studies in the Philosophy of Science},
volume          = {266},
}


If I cite ic:bedau:2009:01 when using \addbibresource{bibliography.bib}, the cross-reference to c:barberousse:2009:01 is resolved successfully. If I cite it when using \addbibresource[location=remote]{<url>.bib}, however, the cross-reference is not resolved, unless I happen to also cite c:barberousse:2009:01 somewhere else in the text.

I am using an up-to-date version of MacTeX and compiling with pdflatex -> biber -> pdflatex.

Any ideas? Can someone at least confirm that they face the same issue? MWE below.

# MWE:

\documentclass{article}

\usepackage[backend=biber]{biblatex}

% If I fetch the file from a remote location, cross-refs are not resolved.
% If the file is stored locally, everything works okay.

\begin{document}
% Does not resolve cross-reference.
\cite{a:watson:2014:01,ic:bedau:2009:01}.
% Resolves cross-reference because it is also cited explicitly.
% \cite{a:watson:2014:01,ic:bedau:2009:01,c:barberousse:2009:01}.

\printbibliography
\end{document}

• Your MWE gives me the following error in the blg-file. Seems like an encoding problem, or the file is corrupt: [11450] Utils.pm:169> WARN - BibTeX subsystem: C:\Users\Besitzer\AppData\Local\Temp\ogRl1vx8ui\biber_remote_data_source_Xu9Jt.bib_924.utf8, line 3, warning: 18 characters of junk seen at toplevel – musicman May 9 '14 at 16:10
• @musicman Those junk characters are headers I use to separate journal papers from conference papers etc -- they are a non-issue, really. I always get that warning, but the cross-referencing issue occurs only when I fetch the .bib file from a remote location. – sudosensei May 9 '14 at 16:18
• Maybe you'd like to set up a truly minimal example with a stripped-down version of your .bib files containing just one or two entries that show the behaviour. (I think the bib-abbrev.bib file could easily be eliminated from the MWE; preferably a really minimal example would also not trigger other warnings anout junk chracters etc.) So the issue is easier to investigate. – moewe May 10 '14 at 12:43
• This was a bug and should be corrected in the biber 1.9 available in the DEV folder on SourceForge. You need to be using biblatex 2.9 DEV version with biber 1.9 (also on SourceForge). – PLK May 10 '14 at 18:53
• @PLK That is great to hear! Could you write this as an answer so that I can accept it, please? Thanks a lot for your prompt reply! – sudosensei May 10 '14 at 20:56

• Just tested using biber 1.9 and biblatex 2.9. Everything works like a charm! Thanks for your help, and for your fantastic work on these two packages. – sudosensei May 11 '14 at 12:17