Created attachment 39907 [details] The PDF file exhibiting the problem. With poppler, the summation signs in the attached PDF file are rendered as black dots. This is reproducible with 0.15.1, as well as 0.14.4.
Created attachment 39908 [details] 63.pdf, as rendered by pdftoppm.
Created attachment 39909 [details] Screenshot of Adobe Reader rendering the file on the same system
*** This bug has been marked as a duplicate of bug 31235 ***
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