Weird problem in TeXworks but not command-line

Dear Miktex-Users,

I have a baffling issue.

I put this in bug.tex using TeXworks:

\documentclass{article}
\usepackage{mathabx}
\begin{document}
$$\vvvert$$
\footnotesize
$$\vvvert$$
\end{document}

Then I build using the green "play" button in TeXworks. This is the output
I get:

This is XeTeX, Version 3.1415926-2.4-0.9998 (MiKTeX 2.9 64-bit)
entering extended mode
(C:\Users\Sébastien\Dropbox\2013\miktex-bug\bug.tex
LaTeX2e <2011/06/27>
Babel <v3.8m> and hyphenation patterns for english, afrikaans,
ancientgreek, ar
abic, armenian, assamese, basque, bengali, bokmal, bulgarian, catalan,
coptic,
croatian, czech, danish, dutch, esperanto, estonian, farsi, finnish,
french, ga
lician, german, german-x-2012-05-30, greek, gujarati, hindi, hungarian,
iceland
ic, indonesian, interlingua, irish, italian, kannada, kurmanji, latin,
latvian,
 lithuanian, malayalam, marathi, mongolian, mongolianlmc, monogreek,
ngerman, n
german-x-2012-05-30, nynorsk, oriya, panjabi, pinyin, polish, portuguese,
roman
ian, russian, sanskrit, serbian, slovak, slovenian, spanish, swedish,
swissgerm
an, tamil, telugu, turkish, turkmen, ukenglish, ukrainian, uppersorbian,
usengl
ishmax, welsh, loaded.
("C:\Program Files\MiKTeX 2.9\tex\latex\base\article.cls"
Document Class: article 2007/10/19 v1.4h Standard LaTeX document class
("C:\Program Files\MiKTeX 2.9\tex\latex\base\size10.clo"))
("C:\Program Files\MiKTeX 2.9\tex\latex\mathabx\mathabx.sty"
("C:\Program Files\MiKTeX 2.9\tex\generic\mathabx\mathabx.dcl"))
(C:\Users\Sébastien\Dropbox\2013\miktex-bug\bug.aux)TFM file
C:\ProgramData\MiKTeX\2.9\fonts/tfm/public/mathabx\matha8.tfm already
exists.
miktex-xetex.exe: The font file could not be found.
miktex-xetex.exe: Data: matha8

I can confirm that no PDF file is generated. Then, I open a command line
window using cmd.exe. I do this:

C:\Users\Sébastien\Dropbox\2013\miktex-bug>xelatex bug.tex
This is XeTeX, Version 3.1415926-2.4-0.9998 (MiKTeX 2.9 64-bit)
entering extended mode
(C:\Users\Sébastien\Dropbox\2013\miktex-bug\bug.tex
LaTeX2e <2011/06/27>
Babel <v3.8m> and hyphenation patterns for english, afrikaans,
ancientgreek, ar
abic, armenian, assamese, basque, bengali, bokmal, bulgarian, catalan,
coptic,
croatian, czech, danish, dutch, esperanto, estonian, farsi, finnish,
french, ga
lician, german, german-x-2012-05-30, greek, gujarati, hindi, hungarian,
iceland
ic, indonesian, interlingua, irish, italian, kannada, kurmanji, latin,
latvian,
 lithuanian, malayalam, marathi, mongolian, mongolianlmc, monogreek,
ngerman, n
german-x-2012-05-30, nynorsk, oriya, panjabi, pinyin, polish, portuguese,
roman
ian, russian, sanskrit, serbian, slovak, slovenian, spanish, swedish,
swissgerm
an, tamil, telugu, turkish, turkmen, ukenglish, ukrainian, uppersorbian,
usengl
ishmax, welsh, loaded.
("C:\Program Files\MiKTeX 2.9\tex\latex\base\article.cls"
Document Class: article 2007/10/19 v1.4h Standard LaTeX document class
("C:\Program Files\MiKTeX 2.9\tex\latex\base\size10.clo"))
("C:\Program Files\MiKTeX 2.9\tex\latex\mathabx\mathabx.sty"
("C:\Program Files\MiKTeX 2.9\tex\generic\mathabx\mathabx.dcl"))
(C:\Users\Sébastien\Dropbox\2013\miktex-bug\bug.aux) [1]
(C:\Users\Sébastien\Dropbox\2013\miktex-bug\bug.aux) )
Output written on bug.pdf (1 page).
Transcript written on bug.log.

C:\Users\Sébastien\Dropbox\2013\miktex-bug>xelatex bug.tex
This is XeTeX, Version 3.1415926-2.4-0.9998 (MiKTeX 2.9 64-bit)
entering extended mode
(C:\Users\Sébastien\Dropbox\2013\miktex-bug\bug.tex
LaTeX2e <2011/06/27>
Babel <v3.8m> and hyphenation patterns for english, afrikaans,
ancientgreek, ar
abic, armenian, assamese, basque, bengali, bokmal, bulgarian, catalan,
coptic,
croatian, czech, danish, dutch, esperanto, estonian, farsi, finnish,
french, ga
lician, german, german-x-2012-05-30, greek, gujarati, hindi, hungarian,
iceland
ic, indonesian, interlingua, irish, italian, kannada, kurmanji, latin,
latvian,
 lithuanian, malayalam, marathi, mongolian, mongolianlmc, monogreek,
ngerman, n
german-x-2012-05-30, nynorsk, oriya, panjabi, pinyin, polish, portuguese,
roman
ian, russian, sanskrit, serbian, slovak, slovenian, spanish, swedish,
swissgerm
an, tamil, telugu, turkish, turkmen, ukenglish, ukrainian, uppersorbian,
usengl
ishmax, welsh, loaded.
("C:\Program Files\MiKTeX 2.9\tex\latex\base\article.cls"
Document Class: article 2007/10/19 v1.4h Standard LaTeX document class
("C:\Program Files\MiKTeX 2.9\tex\latex\base\size10.clo"))
("C:\Program Files\MiKTeX 2.9\tex\latex\mathabx\mathabx.sty"
("C:\Program Files\MiKTeX 2.9\tex\generic\mathabx\mathabx.dcl"))
(C:\Users\Sébastien\Dropbox\2013\miktex-bug\bug.aux) [1]
(C:\Users\Sébastien\Dropbox\2013\miktex-bug\bug.aux) )
Output written on bug.pdf (1 page).
Transcript written on bug.log.

I can confirm that this PDF file is properly created.

When I first got this problem, I uninstalled Miktex and reinstalled.
Problem showed up again. I uninstalled and then reinstalled, but then I
made sure to download all the packages. Still the same problem as above.
What am I doing wrong?

Thanks,

-- 
Sébastien Loisel
Department of Mathematics
Heriot-Watt University
Riccarton EH14 4AS
United Kingdom
web: http://www.ma.hw.ac.uk/~loisel/
email: S.Loisel at hw.ac.uk
phone: +44 131 451 3234
fax: +44 131 451 3249
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