I'm curious as to why it only affects some. I've never had issues at all and still don't.
This is an issue with their SSL termination servers in certain datacenters, as Mike alluded to. I experienced the same issue with their HK servers, meanwhile US servers worked fine. It has zero effect on non-SSL traffic, by the way.It's worth noting the CloudFlare specifically listed issues with Sydney and Melbourne (with a fix rolled out today).