I cannot edit a pdf file, although I can select the text I want to replace. Instead I get text on top of the pdf text. The pdf file was originally an image, but I used "recognize text" before trying to edit the text.
You should see a blue bounding box around the text before you edit it when using the Edit Document Text command -- do you see this? If you chose the Clearscan option during OCR, you'll need to change the font first prior to editing the text.