I recently upgraded Slackware and a whole bunch of updates came down. Several things broke - CUPS and Chromium.
Today a new series of changes came down and I saw that CUPS had a small update. I tried setting my Laser printer again, and look at that - it worked. Printing is working again.
I only upgraded my work computer, didn't do my home computer or the servers yet. It's probably at a state now where I can upgrade and everything will work (except Chromium and I can wait for the changes for that to come down).