I met similar issue with Cal V2.73 and win 7 x64.
I used to open "Metadata Modify" window and press the bottom button "Metadata Download".
Metadata Search ran like Swiss cuckoo clock for years.
I did not change any params. And one day this search hangs Calibre. No error message. I have to kill the freezed process.
Strangely, Book cover download was ok.
I update to 2.79 and the issue was still there.
Right now I found a way to bypass the issue.
Ctrl + D
and I click first left button "Download only Metadata".
It works fine. You can manually choose which field to update.
Best regards
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