Big crash problem (RB DJ & RZ)

While just having a routine practice and learning the RZ I adjusted the Cross Fade Curve via the knob at the bottom of the RZ...however this gave a almighty SCREECH!! on the Master output and subsequently crashed the programme, all sound & response lost.

Had to close and reboot RB, when I did audio driver settings had changed from RZ Asio to Line in RZ.

Major inconvenience!!!

Needs sorting pioneer.