Waves Studio Rack VST crashes host

The VST3 is fine, but the VST2 version of Waves Studio Rack (available for free from Waves in your account) will crash at with a EXC_BAD_ACCESS error

 result = vstEffect->dispatcher (vstEffect, opcode, index, value, ptr, opt);


 pointer_sized_int dispatch (int opcode, int index, pointer_sized_int value, void* const ptr, float opt) const