Julie andrews and Camelot
There has been a puzzlement with board members who do not know why Julie Andrews was not in Camelot when she created the role on Broadway. I found an old article that came out when Julie didn't get the part. Here's the quick read through.
Jack Warner learned his lesson when he didn't cast her in My Fair Lady so he offered her the role. Josh Logan didn't want her because she didn't look the part and he didn't think she could successfully act the new script which called for drama instead of comedy. Since Warner held the strings, he wanted Julie. Julie didn't want to do it stating she was booked for the next five years. Warner lost and Logan was left to cast. He chose Vanessa Redgrave and she ended up receiving rave reviews (including she was the best change over the the Broadway show) and many nominations and awards (except the Oscar. It was 1967 for PETE'S SAKE!)
That's the true reason.