Nonlocal signaling in the configuration space model of quantum-classical   interactions
  When interactions are turned off, the theory of interacting quantum and classical ensembles due to Hall and Reginatto is shown to suffer from a nonlocal signaling effect that is effectively action at a distance. This limits the possible applicability of the theory. In its present form, it is restricted to those situations in which interactions are always on, such as classical gravity interacting with quantized matter. 
Michael J. W. Hall, Marcel Reginatto, C. M. Savage
quant-ph gr-qc