Hmmm, thanks for that - unfortunately, this just confirms that it is an XML exception, so at least I know where it's located
I'll upload a debug version at the weekend which provides more information - however, if you got the time, could you please quickly try whether that occurs for any type of destination? I.e. could you set up a new journal with only one page and some sketch or something on that (fgruber noticed that empty pages may crash), remove all other partnerships and set up a sync with (1) a OneNote page, (2) a OneNote section and (3) a notebook - maybe that will help getting at the bottom of it.