I have been working on compiling a number of smaller PDFs into one larger PDF for a manual I am working on. I had everything compiled a few days ago and a co-worker added a new pto the PDF yesterday that needed to be included. As I was proofing I have come to discover that on random pages there are missing letters that were not missing prior. I have done many searches but cannot find why this is happening or how to fix it. I have tried to replace these pages with the original PDF but every time I replace the page the letters continue to be missing. I have included a small example of the missing letters.
As you can see it is does not make any sense with the missing letters. IS there anyway to fix this problem without starting over? This is a 110+ page manual.
I am working with Adobe Acrobat Pro 10