I have the same problem i think...
since yesterday i can open it, but if i want to add a book into the library or send to my paperwhite: no response.
And it took a long while before i can close it. task manager? Nope, doesn't help. ALT+F4, Nope, the same.
I don't know if someone will answer u who have more ideas, but for me i found zamzar.com, an online converter. works well for me if no one cares about us here.
have a nice day.
Sumi ^^
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