I'm hoping someone can help me solve this issue. I have Adobe Reader 9.1 and have been editing a PDF that was enabled for commenting and
text edits by another party. However, when I went to open the PDF tonight, I got a message telling me "The document enabled extended features in Adobe Reader. The document has been changed since it was created and use of extended features is no longer available" and I can no longer use sticky note and text editing tools. Does anyone know how to fix this?