Words and letters missing after exiting and reopening document

This happens to me roughly once a month. It can be any document, ones I create or from other people. I save copies of any PDF that I have to sign so if something happens to the signed one I have the unsigned PDF. I go into "Fill and Sign" move the text around and 99.99% of the time it fixes the problem. Its like it has to update the text to show "Oh yes these letters are still here" Have never found a solution and I have been dealing with this since 2023. I have given up on Adobe ever fixing any thing.

Try embedding the fonts or converting the fonts to outlines via Preflight and check.

I'm also having this problem on Windows 11 - created a pdf and it keeps disappearing random letters and numbers when I save it. All the same font so no reason for it to be random letters. A pdf that I created so it's not been emailed from elsewhere.  Changing the missing letters to or from bold, or italics and back again displays them again. Running very slow too, even though CPU and memory on laptop is OK. Acrobat is so unstable, but maybe it has yet to be updated for compatibility with windows 11?

I had a PDF once that behaved similarly.  I didn't create it, but when I opened it, I had some characters just refuse to show.  After much hair-pulling, I stumbled on the fact that there were some stray characters from a non-English, non-standard typeface.  If I recall, there was an F-like character that wasn't really the letter F at all.  Once I replaced it, the PDF seemed to magically work as it should.  Can you spot anything out of place by Document Properties>Fonts?

Do you get the impression that the characters are there, but not displaying, or actually missing from the text stream?

My best,

Dave

Open up Acrobat's preferences, then go to the "Page Display" category. In the "Rendering" section, you will find a setting called "Use local fonts". Does it make a difference when you change this setting?