Update.
After contacting Sony Pro phone support I have confirmed several things.
1) macOS Sierra (v10.12.3) is not supported by the current Optical Disc Archive software version which includes the Optical Disc Archive Utility(v4.0.1) and ODS firmware(v1.670).
2) The Sony tech said an Optical Disc Archive software update is scheduled to be released this month(February)
3) The Sony tech also said the data stored on the cartridges should be fine but I won’t be able to access it until the new Optical Disc Archive software update is installed. I might be able to revert OS, but if the new ODA software update is slated for release this month I’d rather wait and avoid the headache.
I will admit, I should have followed conventional protocol when it comes to updating OS: Check all hardware drivers and software for new OS support before updating. And/or, at the least, wait a full six months after the initial new OS version’s release before updating. Like most editors, I was taught that early on by wise tech folk. Should have headed that warning on this.