We just recently upgraded to 9.1, actually Pharos upgraded for us. I am new in this role so it was kind of a training as well. We built a new Mac package during the process. For whatever reason on some Macs, printing to B&W does not bring up the popup. It's not an issue on all Macs and doesn't seem to be an OS version issue. My main computer is a mac running 10.13.6, works fine, B&W brings up the popup. I have a freshly wiped Mac running 10.13.6 and I am able to replicate this issue. I am not sure what else to check. It doesn't appear to be a gatekeeper or administrator issue.