Windows 8 geforce gtx 770
(any version with smoke/cycles enabled)
When the adaptive domain from a smoke simulation changes sizes the smoke renders differently from frame to frame when using cycles and the cpu (eg flickering, shifting) , this was a problem with the blender internal render as well but there was a work around by duplicating the domain, this does not seem to work with cycles.
Exact steps for others to reproduce the error
render out a smoke simulation in which the adaptive domain is changing sizes locations slightly