I have the exact same problem as Maghangi occuring in 46 out of 110 .note files I’m trying to read.
Thank you for contacting support. Please share your problematic OneNote documents in this forum thread. We’ll take a closer look and guide you accordingly.
It’s nice to hear from you that you managed it. Aspose.Note API supports the Microsoft Office OneNote 2010-2013 formats. Please feel free to reply us in case of any further assistance.