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The only way a hang can happen is if some metadata download plugin is hanging and no other plugin is finding covers. I suggest you disable/uninstall any third party metadata download plugins you have, as far I recall, all the builtin plugins use timeouts on network requests, so they cannot hang indefinitely, cant speak for third party plugins.
And update your calibre install to be able to get metadata from amazon again, as pointed out earlier in this thread.
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