[R-pkg-devel] CRAN Vignette pdfs garbled in Firefox pdf viewer

[Mike Blazanin]

Hi all, my package gcplyr has several vignettes which, from CRAN, appear
garbled when opened with Firefox's pdf viewer (
https://cran.r-project.org/web/packages/gcplyr/index.html). Specifically,
instead of regular characters, there are numerous black-outlined white
boxes with text inside like "EO 88" or "EO 55". This doesn't occur with the
pdf vignettes on Github (https://github.com/mikeblazanin/gcplyr/). This
also doesn't occur when CRAN pdfs are opened with Chrome's pdf viewer or
Microsoft Edge's pdf viewer, nor when files are downloaded from CRAN and
opened with a local pdf viewer.

The issue was documented here:
https://github.com/mikeblazanin/gcplyr/issues/112

Anyone have any suggestions for what could be causing this?

Thanks!
Mike Blazanin

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