Web browser: ---
            Bug ID: 61026
           Summary: PNG rendering of <math> produces "Failed to parse"
           Product: Wikimedia
           Version: wmf-deployment
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: Unprioritized
         Component: General/Unknown
    Classification: Unclassified
   Mobile Platform: ---

Created attachment 14522
Screen capture

When accessing articles with elaborate equations (presumably using more
advanced TeX tokens), with PNG rendering of math, a big red error is displayed
instead of the equation. Shown error is of the form:
Failed to parse(unknown function '<some token>'): { ... equation's TeX source
goes here ... }
The token I often see as unknown is "\begin".

When using MathJax rendering, equations appear with no visible problems.

Issue doesn't appear to be related to browser (seen with both Firefox 26 and
Internet Explorer 10).

Example article producing this:

Attached screen capture of this article, in PNG rendering mode.

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