Uninstall, reboot and reinstall as it may be files have not been replaced correctly.
Sorry but not working for me
First, i uninstalled Start11 then -> REBOOT
Installing the demonic KB5022913 -> REBOOT
Installing Start11 1.4Beta -> REBOOT
Then this is the result :
As you can see, no systray (i see help bubbles, so it should be hidden behind something),
No "Small" taskbar, only small icons,
Weird texture between start buttton and taskbar :/
Way to fix it :
Uninstall KB or uncheck taskbar enhancement on Start11.
Anyway thank you very much for the effort. Keep going !