FIX Found.. It seems to not glitch with the Titan at all. However, We found that running the Onslaught playlist appeared to clear the error for other characters; now we did go make that first potion with another character (titan) , then switch back to the character that was stuck; once we ran the Onslaught (with stick character), it progressed back to step 2 but allowed me to create the potion. Hope this works for others. I don't know if making a potion with another character is even necessary, but that's what worked.