Can you check to see if you have the same version now as your wife?
If that is ok, while on that app screen click on the clear cache (this wont delete anything as cache will just get recreated), something might have been updated with the later version
Now try opening your book again and see if it works
If you still have problems, you can click the clear data option from the kobo app, but this will delete all your books from the arc and it will have to download them again
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