Mark, THANK YOU SOOO MUCH for your post. Flushing all permissions and clearing the cookies did the trick. It works!!!
Can you elaborate on why changing session_cookie_path to a slash made this Doodles tutorial work?
Thanks again for your tidbit!
Brian, So by doing this that allows everything access, is there a security risk?
I can confrm that changing session_cookie_path back to "/" solved the 401 error on lang.js.php for me. (MODX created several cookies for every subdirectory, which is wrong behaviour) So I could finally login to my own website again.