Regarding the Note:
NOTE: An important thing is to save the files in the UTF-8 encoded text format. Otherwise, some strange characters could appear instead of any special characters used by different languages, like accented letters, symbols, etc.
We have found the opposite. In particular the files:
...\FCKeditor\fckconfig.js
and
...\FCKeditor\fckeditor.asp
Must be saved in file format: ANSI
not UTF-8
Open the file with notepad, save as... ANSI encoded text format.
Then upload the files to the server, empty the cache and reload the page.
We are a web-agency in Italy, I'm not sure if that matters but, there you have it.