disabled experimental treatment of replacement text for now, which leads to odd spacing and strange effects on non-poppler viewers;
--- a/doc-src/pdfsetup.sty Wed Jan 12 14:13:04 2011 +0100
+++ b/doc-src/pdfsetup.sty Wed Jan 12 14:34:11 2011 +0100
@@ -18,7 +18,8 @@
\def\isaliteral#1#2{#2}
\def\isanil{}
-\ifpdf
+%experimental treatment of replacement text
+\iffalse
\ifnum\pdfminorversion<5\pdfminorversion=5\fi
\renewcommand{\isaliteral}[2]{%
\pdfliteral direct{/Span <</ActualText<#1>>> BDC}#2\pdfliteral direct{EMC}}