I did not install KB2859537 (due to potential of BSOD), and have been following this thread.
It appears that KB2859537 has been superseded by KB2872339 ??
However, the description for KB2872339 states that there are some known issues with that update that can result in a STOP 0x6B if the following registry entries are missing.
Really Microsoft? How many people know enough to check their registry before installing an update that MS sends and will install automatically if that's how you have it set (luckily I don't).
I am not going to install KB2872339 until I do some checking.