Cannot search or select text in Acrobat 7 Pro after adding and undoing comments
I have a document that is in PDF Version 1.5 (Acrobat 6.x). When I open it in Acrobat 7 Pro I can search, select text, and add comments just fine.
After adding a comment and then undoing it I can no longer search, select text, or add comments.
I then opened the document in Adobe Reader DC to continue adding comments, but now it is no longer searchable in Acrobat 7 Pro. The document is still searcheable ion Reader DC.
Any suggestions how to "fix" the file? I tried to OCR just in case the file had somehow turned into a graphic, but got a message that the document was already text (not surprising since the file size had not changed).