Thank you for the advice on the roll-back. I've checked out the HP website and some suggestions have helped, others have not.
Today we had a new error message appear: Printer operation cannot continue due to lack of resources.
I looked that up at the HP website and found out that that is strictly a Drivers Error. And one department was totally unable to print. I followed the guidelines, and finally got them printing. I attempted the same with the other affected department and it did not work. Very frustrated about that. TGIF.
And, in the future, I will only post to one forum. Thank you for the advice.