The versions dropdown also ignores the existence of CC 2017 (see attached capture.) Both 20 versions of PS and IL run without issue. I have run both PS CS 2018 and IL CS 2018 thinking results might be similar but Creative Cloud refuses to acknowledge the CC 2017 versions. The Lightroom update worked out OK once I fired up the new 'Classic' version and upgraded from 2015. The same thing is happening with Illustrator.
I've followed the instructions for renaming the opt.db file to no avail.
The Creative Cloud menubar app does not acknowledge the existence of CC 2017 and the 'Uninstall' link inside the 2017 folder throws an error stating the alias can't be opened.