This may be a temporary glitch, but in case not, I figured I'd let you know - since last night, attempting to add books to my shelves gives me the "The request contacting Goodreads has failed. Please try again." error, with the following details:
calibre, version 0.8.48
ERROR: Goodreads Failure: The request contacting Goodreads has failed. Please try again.
Response Code: 404
<html><head><meta name="robots" content="noindex" /></head>
As I mentioned, I know Goodreads is in the middle of a big redesign and things have been acting oddly as of late, but as it's a slightly different error message than others have reported and appears to be ongoing, figured it couldn't hurt to let you know - even if there is nothing we can do about it from our (that is, not a GR developer's) end.
Thanks for a great plugin!
edit: Huh. Looks like that error just came up with one particular book - when I try and add others, it disappears. How odd. Leaving this here for posterity, I guess. Sorry.