I am also seeing this error. It is happening under Chrome on Mac and Android. I looked in the logs and found this error whenever I try to view a comic.

20150426 12:10:36 [pool-2-thread-1] WARN com.ubooquity.e.e - Interrupted while sending response (perhaps the client stopped the download) - java.net.SocketException - Broken pipe
20150426 12:10:36 [pool-2-thread-2] WARN com.ubooquity.e.e - Interrupted while sending response (perhaps the client stopped the download) - java.net.SocketException - Connection reset