Well, I did some research on this, but came up with nothing concrete.
I normally have the cutter disabled in the printer dialog and prefer to use the front panel switch on the Z to feed and cut after each print. It's been working fine for 6 years.
Yesterday, after making a print, I pushed the button and the paper fed forward in preparation for the cutter and then ... nothing. The machine made no effort to retrieve the cutter head from the left side of the printer.
So far, I have unchecked the cutter disable in the printer dialog, set the cutter to "on" in the HP Print Utility/Settings, checked those settings several times to make sure they stuck, rebooted the printer and computer several times each, finally reset the cutter life counter on the printer front panel menu and rebooted the printer again.
Still get the same behavior. I get no errors, just mo attempt by the printer to retrieve the cutting head.