Retrologue crashes under Cubase 9 more often than any of the now blacklisted VSTs ever did for me. Just random crashes with macOS Sierra.
I’m currently just testing the sidechain with a sample track and Retrologue like in the Cubase 9 presentation videos.
I’m not impressed at all with the advertised “stability” so far. And I’m just 30 minutes in.
System Integrity Protection: enabled
Crashed Thread: 0 Dispatch queue: com.apple.main-thread
Exception Type: EXC_BAD_ACCESS (SIGSEGV)
Exception Codes: EXC_I386_GPFLT
Exception Note: EXC_CORPSE_NOTIFY
Termination Signal: Segmentation fault: 11
Termination Reason: Namespace SIGNAL, Code 0xb
Terminating Process: exc handler 
Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0 com.steinberg.Retrologue 0x000000013c96bbb1 0x13c5ca000 + 3808177