I have downloaded .pdf book from www.archive.org
and some (random) letters are missing when trying to read it on KF. Althought the content is readable, it is very annoying to guess the missing characters again and again.
It doesnt matter whether I use native reader, Montano or Aldiko. Nevertheless, PC does not have any problems reproducing the content.
The file itself seems to be OCR-ed.
Any ideas what could be the issue here?
Original file is accessible on: