I'm using Windows 11 Pro Version 10.0.22000 Build 22000
I have absolutely not installed any other software to manage the taskbar and have not touched my system registry. I had no problems with the previous version of Start11 and hadn't changed any of its settings in a week or so.
I cannot set Start11 not to enhance the taskbar, since it thinks something else is enhancing it. The only way to get it to work is to kill explorer via the Task Manager and then run explorer.exe.
If Start11 is uninstalled, the taskbar successfully returns to the normal Windows 11 one, including after a couple reboots
The only clue I have as to what's going on is that in the start menu, there is the normal "Start11" shortcut and a second "Stardock Start11" shortcut with no icon (shows the default for a missing icon) and if I click on it, a window shows for a split-second and then goes away (there is no content in the window, just the frame). This erroneous icon was not there before the update, and it shows back up upon reinstallation.
My guess is that somehow the update didn't remove/unregister the previous version and now it's taking ownership of the task bar and crashing on startup since the supporting installation files have changed with the update.
Also, when I reboot, there are two instances of the Start11_64.exe in the Task Manager. I checked the startup apps setting and didn't see Start11 listed at all, and there is only one entry for the service in Task Manager and in services.msc