First off, why on God’s green earth when something is working do they have to go and break it!? Below is how to change your choices in Yahoo Mail so you can sort your e-mail by Sender. (click on the images below to see the full image)
The following is courtesy of www.TheWebElves.Net. They found it for me and I just had to share because no one else has!
How to Sort by other than date or unread or attachments or starred (the most unhelpful choices – beyond unread)