After updating to this or later versions, it may be necessary to configure the planner_queue_size to 32. The previous default in the config files was 64.
With a setting of 64, Smoothie has been observed to crash (halted printer movement and become unresponsive to controls) mid-print. This was on a Smoothie with the planner_queue_size of 64 while also configured for the Kossel arm solution.