calibre 0.4.136 on Ubuntu Intrepid.
I used calibre to convert a rtf book to lrf. It failed (many errors reported) . It was really a complicated rtf text with many different and unusual fonts. It had been created by Acrobat 7 from an original pdf book. I changed the whole text to Times New Roman 12 and after that the conversion to lrf was successful.
Except one character which was rightly but mistakenly translated by the expression "RIGHT SQUARE BRACKET" and which appeared 1032 times in my 400 pages book.
I cannot identify it so I give an excerpt of the text where it appears :
".../...unfamiliar to you ― but soon everyone with a computer .../..."
It's just this very long horizontal bar between the words "you" and "but" which is not "-" nor "_"
As I had also another book where it happened, I suggest that some modification to the conversion tools be applied so that the expression "RIGHT SQUARE BRACKET" appears no more. It was also the same for rtf to epub conversion.
Thank you.