Originally Posted by john_es
Kovid - Does this mean that valid books showing errors is a new feature with .9.20? I am not trying to be sarcastic, just trying to figure out if books that are good everywhere else that now show an error in Calibre was done deliberately. because it sounds like now that malformed XHTML files can be viewed, good books show an error.
What I believe Kovid is saying is he put in some code so your epubs can be viewed even though they are technically malformed. Have you tried viewing those ePubs in 0.9.20?
Kovid also added this fix
that will be out with 0.9.21, unsure if it applies to this thread.