Problem with diacritics when export in Acrobat(PDF)

If inside PDF are squares, you should tyr font-subset embedding.

But squares appear also when in PDF everything is ok, but when you cannot to find that word, and if you copy it to MS word (office) you got only rectangles instead of text. This behaviour can be reproduced by adding special chars to the text-box, like: šťďňľčŠĎŤĽŇÓó /not each but some of them will make the entire line to become squares/...

btw: exporting and displaying is done on the same machine (development) and the issue is still there...