|
I don't know if next week's update will fix it, but some epubs have such large css files that the Kobo chokes trying to process them into the database. The only cure so far is to leave out the offending file - once you find it.
It sounds like it is one of those second forty files, although, of course, there may be others as well. Try maybe ten at a time... it may be slightly less annoying.
|