Originally Posted by Lunchtray
Just updated my wife's Kobo Touch and side loaded epubs are opening and showing only page numbers with no text on screen. Also, some other books won't even open bitching about Adobe DRM though they have none.
That sounds as if the database got corrupted during the update. You might want to try signing out from Settings / Account / Sign Out. You will then need to sign in again and the Touch will need to rebuild the database. A bit faster than doing a factory reset but with much the same effect.