I use the Preview app every week and regularly add annotations, but sometimes I'll get a document that won't let me highlight text. As a matter of fact, I can't search for a word in the document either. It's as if Preview doesn't recognize it as a pdf and treats it like an image. The document is clearly saved with a pdf extension and my permissions are read/write. What gives and how can I fix it? Thanks. ---------- For the record, I'm using Mavericks and Preview version 7.