Hello all, just a small fix for the Optional content (OC) support. The keywords for the default state (visible or not) must be changed to uppercase letters. spec-fdf.tex: def\flushPDFtextlayers {\ifx\PDFtextlayers\empty \else ... \doPDFaddtocatalog {/OCProperties << % display in menu /D << /Order \!!stringa /On \!!stringb

^^ /ON \!!stringb

/Off \!!stringc >>

^^ /OFF \!!stringc >>

% used properties /OCGs \!!stringa >>}% Thanks to Hans for implementing it. It works perfect and I love it... Greetings, Peter