Me too. Luckily I was monitoring some lengthly database operations, nothing customer-facing.

Sometimes the streaming reply worked, sometimes it hung, sometimes it crashed. After a few days of pain I rewrote it in Node (which is a shame since the rest of the code is in Ruby). Worked 100% first try, no handholding.

I don't care whose fault it is. ActionController::Live should be turned off until it's more stable.