After updating to the latest release, I can no longer right click on the DF taskbar icon for the many programs and get the same or very simlar menu options that I do when performing the same action on the Windows Taskbar on my primary monitor. This worked on the varsion 11 and older releases, but stopped with version 12 of DF. I've also noticed this problem with other programs like Adobe Reader, Greenshot, Thunderbird, all Libre Office applications, etc. I've only found a couple that I use regularly that work very close to the same as the Windows taskbar. Those are Chrome and Firfox.

Any ideas on what could have changed that would have brkoen this functionality?

Yes, but when I disable it they are still different. Here is what I see when disabled on the DF taskbar and what I see on the Windows Taskbar. As you can see I don't get any options for private tab, open previously closed, etc.