Perhaps an access problem? I just had the same issue.
A look into /var/log/http-error-user.log (I think I had to change tthe apache conf to increase the error level first) showed some lines
[error] [client 192.168.1.20] (13)Permission denied: xsendfile: cannot open file: /volume1/calibre/data/....
The x bit for others was missing, chmod -R o+x for the data directory solved this.
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