I am having the same problem, the text is there, but white-ed out and I can't change it. I am working on Adobe on my computer so it's not just a phone app thing, it happens randomly while on working on a PDF or after I've checked it over and saved it and then the nest time I open it all the text I've created using the add text tool in the edit PDF tab are gone. It happens in a variety of my saved PDF's but not all. I use the same base PDF a lot and edit from there so it's not my orginal PDF. Please help.