No AUX in Slice mode in GA4 and Cubase 7.5.3

Every time I try to assign an AUX while in slice mode in GA4, in the mixer it won’t let me put in an effect or even change the output on any of the 4 AUX, and after 2 or 3 attempts, it CRASHES Cubase 7.5.3. This to me is a serious problem as I depend on the AUX’s for sound design. I can use the busses but that is insertion of the effects. Is this a known bug?

17" Macbook Pro (late 2011) quad core i7 @ 2.4 GHz with 16 GB DDR3 1600 MHz Ram running Mavericks 10.9.4
Cubase 7.5.30