This may be due to what's describe in the hyperref doc:
http://www.tug.org/applications/hyperref/ftp/README
* Be aware that not all PDF viewers support this feature, not
even Acrobat Reader itself:
Some support:
* AR7/Linux: "underline" and "dashed", but the border width
must be given.
* xpdf 3.00: "underline" and "dashed"
Unsupported:
* AR5/Linux
* ghostscript 8.50
So it may be that these boxes were there (in the doc) before, but
weren't supported in poppler or acrobat reader, and now they are (?)
--
Internal and external links diplay and print problem
https://bugs.launchpad.net/bugs/156643
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