We have to supply 508-compliant (accessible) pdfs that read out loud to clients. This hasn't been a problem until our Mac OS was upgraded to OS 10.7.5 (from 10.5.8). We are running Acrobat 10.1.7. If you click on a word, it will read that word, but no more. The pdfs still read correctly in the older OS. I downloaded a trial version of Acrobat 11 and that doesn't work either. Has anyone run into this problem? Any suggestions? Thanks.