Edited pdf file becomes to unreadable after saving.
Hello guys,
I have been using Acrobat for many years to edit PDF files for work on same laptop.
Suddenly, since last month, I can edit and it appears till I close the pdf file. But what I changed/edited becomes unreadable when I open the file again. I tried uninstalled this program and install again. I also tried many different pdf files. Plus I tried with other fonts as well.
< Example >
* This is the original pdf below.

* I changed invoice number and I can see changed part after I save and till I close this file.

* But, it becomes unreadable when I re-open the file after seconds.

Is there anyone who had the same issue and sorted out???
Need help 😞
