Nick Howitt wrote:

Google gives plenty of hits, and I notice ghostscript updated a couple of nights ago. Has your system updated to the new package, ghostscript-9.07-31.el7_6.11.x86_64?

"Recent Software Activity: (ghostscript)
ghostscript-cups-9.07-31.el7_6.11 Updated May 15, 01:16:03
ghostscript-9.07-31.el7_6.11 Updated May 15, 01:15:59
ghostscript-cups-9.07-31.el7_6.10 Updated Apr 17, 04:20:32
ghostscript-9.07-31.el7_6.10 Updated Apr 17, 04:20:30
ghostscript-cups-9.07-31.el7_6.9 Updated Apr 13, 02:23:33
ghostscript-9.07-31.el7_6.9 Updated Apr 13, 02:23:29"

Actually, the ghostcript-cups upgrade from _610 to _611 may be the issue. I need to understand how to roll back the 15 May _6.11 to try the 17 Apr _6.10 to see of this solves the problem. At least, as a test....