Ma Gorg's look changed at the same time too
You'll also notice Ma Gorg also changed at the exact same time the change with Gobo was made. Then at the begginging of the next season her voice changed, because she was recast by Cheryl Wagner when Myra Fried quit. I didn't mind when they changed Ma Gorg's look. In fact she looked much better. But I really did not like it when they changed her voice. She sounded so annoying, I couldn't stand her voice anymore. I like her original voice cause it was calm and peaceful. I think Ma Gorg was the best during the few episodes when she had her new look, yet her old voice. JMO