Hello,
Sorry to hear you are having issues. I just checked and Windowblinds 11 work with Windows 11 24H2 and Start11 v2.49.1 (Beta) refer screenshot below. Please try these steps. Uninstall Start11, reboot immediately after uninstall is done, download Start11v2.49 (Beta) or Start11v2.11 (if you not wish to install Beta version) Install it, reboot again. Retest. If the issue still there, repeat above steps for Windowblinds 11. Remember to reboot. Retest and report back.
Also, please check if you also using other 3rd party software that change how your taskbar work.

Thank you.
Basj,
Stardock Community Assistant.