I think that it was just because Shannen couldn't work with Alyssa,so she decided to leave.I also watched an interview of shannen on youtube a while ago,and she said that another reason why she decided to leave was because she 'Didn't have time for drama in her life anymore'....And i dont think they were allowed to show pictures of her in 'forever charmed' because if they did show an image of her,it said that she was entitled to her full pay,and they didnt want to give it to her or something like that anyway..... confused