Ok, what I see it's that Chrome do the petition but for some motive it sit idly waiting for the response. The only idea I have is that you try to use some local proxy to get around this (Polipo, Privoxy, "Google is your friend for the etc"); if this works try an external free/open proxy. Also I don't know if you forgot about it, but you tried to put the url in the address bar and see if the file is downloaded?
Last thing to do is to report a bug against chrome describing the problem that you are
suffering (yeah, w/o mangas, that's it) or try the distribution list for users of Google Chrome or lastly the forum of chrome
https://productforums.google.com/forum/#!forum/chrome . I can't do this for obvious reasons (don't have a mac, don't have frustration about something that doesn't work).
I hope this can help to solve your problem.
PS.: If you post a bug, paste the link in the forum so the others mac users can suscribe to the bug and say that they are affected too.