Try this: Close ADE. In your "My Digital Editions" folder there will be a "restore" folder, rename this to restore.bad (or something close - the point is that it should be restore).
Launch ADE, Close ADE.
Launch ADE, and then drag and drop the .acsm file on it.
(If this works, ADE was stuck trying to process a bad .acsm file, and we were not being good about the error reporting).
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