I was working with a PDF document using Acrobat Pro DC. I needed to respond to questions and place text in table cells. The "Fill and Sign" tool did not work with this document so I used the "Edit PDF>>Add Text" tool. I had no problem clicking on the pages (about 75 pages) and entering the text. I saved the document. Later I had to add more text and edit the text I had already added. Again there was no problem. The third time I needed to add or edit text I looked at my previous additions and half the text disappeared. The text box where the text had been was still there just was empty. Some of the text boxes still contained part of the text (e.g. in a City, State, Zip box the City and State disappeared but the Zip was still there).
Can anyone tell me why this happened and can I do anything to prevent this from happening again?
Did you add any pages from a different document to this document? Did you merge two or more documents? If only seen this problem in these two cases, but that does not meant that adding text could not also trigger it. See here for a potential workaround:
Thank you for your effort. That is quite a workaround, unfortunately unembedding/subsetting fonts did not seem to affect my missing text. Your response prompted me to try a few things, one of which does seem to work. If I return to the page with missing text, enter the "Edit Text" tool, and select all text boxes, I can click on the "Bold" icon and all the text reappears and of course turns bold. Clicking the icon again removes the bold but the text stays visible. I've tested it by saving the document and re-opening and the text is still visible. Unfortunately, the "Edit Text" tool only works on one page at a time. There may be a need for an Action script like the one you described.