The text can then be seen, but it is very faint and hard to read. To use the yellow highlight tool, opacity must now be set at 25%. With opacity set at 100%, which it always had been, the text is now completely hidden. Highlighting did not work as it once did. Within the last two weeks, I noticed a problem. I had no trouble reading the black text “behind” the yellow highlight. Opacity was set at 100%, which is the default on my installation. I used the highlight text tool with no problem. I have been using Acrobat Pro 9 for several months. I think I need to explain the problem in more detail.
