I get the same behavior in my Mac OS environment. The failure is noted in images.log but not in the console printout:

! Undefined control sequence.
\lthtmlindisplaymathZ ->\egroup \centerinlinemath
\lthtmllogmath \lthtmlsetm...
l.162 \lthtmlindisplaymathZ


I have no idea how it's happening, but images.tex contains a definition only for \centerinlinemathS:

\def\centerinlinemathS{%
  \dimen1=\ifdim\ht\sizebox<\dp\sizebox \dp\sizebox\else\ht\sizebox\fi
  \advance\dimen1by.5pt \vrule width0pt height\dimen1 depth\dimen1
 \dp\sizebox=\dimen1\ht\sizebox=\dimen1\relax}

while latex2html clearly wants to emit the desired definition:

    "\\def\\centerinlinemath{%\n" .
" \\dimen1=\\ifdim\\ht\\sizebox<\\dp\\sizebox \\dp\\sizebox\\else\\ht\\sizebox\\fi\n" . " \\advance\\dimen1by.5pt \\vrule width0pt height\\dimen1 depth\\dimen1 \n".
    " \\dp\\sizebox=\\dimen1\\ht\\sizebox=\\dimen1\\relax}\n\n" .

Where is that 'S' coming from?!?

At 02:16 PM 8/13/2014, Matthew Saltzman wrote:
Using latex2html-2012-4.fc20.noarch on Fedora 20 Linux with
texlive-2013-5.20131226_r32488.fc20.x86_64, the following file compiles
with latex (and looks fine as a DVI) or with pdflatex (and looks fine as
a PDF), but fails to compile with latex2html.

        \documentclass{article}
        \usepackage{amsmath}
        \usepackage{html}

        \begin{document}

        \mbox{}
        \begin{align}
          v_j &=
          \begin{cases}
            1 & \text{if this happens} \\
            0 & \text{otherwise}
          \end{cases}
        \end{align}

        \end{document}

The tail of the output when it hangs is:

        Writing image file ...

        This is pdfTeX, Version 3.1415926-2.6-1.40.14 (TeX Live 2014/dev)
         restricted \write18 enabled.
        entering extended mode
        (./images.tex
        LaTeX2e <2011/06/27>
        Babel <3.9h> and hyphenation patterns for 2 languages loaded.

[hangs here consuming 100% of a cpu]

        ^C! Interruption.
        <to be read again>
                           \vfill
        l.163 \lthtmlcheckvsize
                               \clearpage}

        LaTeX2HTML shutting down.

Any suggestions?

TIA.

--
Matthew Saltzman
Clemson University Math Sciences
mjs AT clemson DOT edu

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Julius O. Smith III <j...@ccrma.stanford.edu>
Professor of Music and, by courtesy, Electrical Engineering
CCRMA, Stanford University
http://ccrma.stanford.edu/~jos/  
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