contacts
Contacts auto-complete stopped working!
Also there were no email addresses in the "to" section when trying to create a msg, despite seeing them in the contacts list!
Resolution was to downgrade to classic, log out / in and upgrade again.
254th
ranked

Hi there. I'd like to look into this and help! Please send us a message at @YahooCare on Twitter or on Facebook at our Yahoo Customer Care page. In case you do not have a social media account, we are available at help.yahoo.com
Thank you!
Yahoo team
-
Tim commented
I had also set my contacts to sync with google, which i have now stopped. so it was either that or the downgrade / upgrade of using the latest mail that fixed it :-)