I assume InDesign uses the Acrobat XI resources to generate the exported PDFs.
I have many 1-7 page articles from which I created PDFs via the export function in ID. They all read OK on PC/Apple/Linux based computers.
I assembled all of the articles into one 50 page document in ID and again exported the large file as a PDF.
Several of the articles inside the large document now exhibit problems when viewed on an i Pad or a Mac running OS 10.8.3 (Mountain Lion). PC and Linux do not have this problem.
The problems are, to quote my subscriber: "each paragraph starts with a 'dollar' sign instead of 'Th'. Later the 'Dollar' symbol changes to ' " '. The same thing happens in the Piston Ring article. This doesn't happen on the original PDF files.
Opening the files in Acrobat Pro XI to look for differences does not discover anything although I assume the problem is somewhere in the font files.
Any suggestions?