Your signature says AC 19... is that the version you're having problems with?
Have you tried a fresh file-from-template to see if it is something to do with your file vs the system? The 10.13.6 update should not have made any difference.
One of the forum moderators
AC 28 USA and earlier • macOS Sequoia 15.2, MacBook Pro M2 Max 12CPU/30GPU cores, 32GB