Today I bought a new book from the Kobo store.
When I went to run Kobo Desktop, it performed an update, then downloaded the new book, but won't actually open it. When I try to open it in Desktop, it gives me an error that the file is locked or corrupt. All my old books appear to open fine.
Is this something to do with the new Desktop?
One thing that has recently changed is that I have installed ADE, so I can borrow library books. If I download the Adobe file and open it in ADE, I can read it.
Has my ADE authorisation somehow broken the Desktop? What can I do about it? How can I tell Kobo Desktop to ignore the new book and let me manage it through ADE? What will happen if both programs try to install it on my reader?
To be honest, I'm happy enough to drop Desktop now they've made me go to the stupid recommendations page every time I start it, but I guess I need it for the firmware updates?
(I haven't tried to install it on the reader yet because I am out, and although I have my laptop and reader, I forgot the crucial cable that joins them together.

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I'm on OSX, by the way.