I guess the only question I have for you is are you using the same OS as one would have had when Acrobat X was released?
That version is now long at End of Line (EOL) so there's nothing that Adobe can do to help you. If you've updated your system to a new one that came out after Acrobat X was EOL, there's not much hope there.
One thought I just had was is there a possiblity you're typing with white ink on white paper? Check your ink color.