On "Reading Options", I set the fiels "Encoding for pages and feeds" to ISO-8859-1, which would be correct for portuguese language encoding.
The issue is that ani latin caracters simply do not allow the article to be fully write onto de database. Exactly at the point of the first special latin caracter the article stops, as it was the end of it. The full content of the post is lost since not even the back button recovers it.
That would not happend on 2.1 vesions, I have 2 other blogs still with those versions.