Sorry to hear you are having issues. No, there is no issue using Autohide taskbar with Windowblinds. Need to test out on your system. Try this
1) Set WB to use the Default Windows 10 Theme (Windowblinds disable).
2) Reboot. and see if Taskbar hide.
3) If it does, try the purge and reinstall Windowblinds as mentioned here : https://forums.stardock.com/486023/windowblinds-support-faq#reinstalling
Just make sure to re-download the latest version from your account. Reboot after the purge. Reinstall using the latest version, you just download. Reboot again and retest. Report back here.
Stardock Community Assistant.