Same issue on my iPhone 5!!!
My 2 home PCs don't have QuickTime......but even with Comcast 150/20 HSI service....video was constantly buffering....couldn't get more than 2-3 minutes before freeze-frame/buffer/play/repeat!!
The running blog did help a lot, though......
Yes the running blog saved the day, For me it was from the start, The new iPhones came up and right away i lost it right at the bit i had been waiting for.
Ah well we know now eh