After I installed 6.3b2, I was notified of a large (~400MB) download. I authorized it, but it restarted after downloading nearly 70%. This morning I tried to start again. I know that the download was near the 40% range. When I checked on it after lunch (20 minutes later), the download was back to 0%. Here is a "sample" log.
I wrote about several issues including this one in this thread:
7851.20150422-124744.zip