@PeterJones Thanks for all your assistance, man. I was NOT using global overrides for foreground and background color on the original installation but something caused everything the language styling not to work.
However, I did remember this incorrectly when I used the standalone install and mistakenly turned those both on.
On the standalone installation, when I turned these two options off (even with my original customized stylers.xml file) the language syntax highlighting works again.
As a test, I opened my old install again and it doesn’t have the global foreground and background on, yet the syntax highlighting still does not function.
So while the original VDI shared install still does not work, you have given me a solution that does work. Thank you for your help!!