Don't know what happened but my yahoo email just started working for me and I think it's because I rebooted my phone due battery issue...so it's all good now!! I'm going to delete the yahoo apps...it's annoying!!
Have the same problem too and am using the yahoo apps instead till they fix the problems...the yahoo apps is annoying to me...just wanted to back to a simple email!!
My email is not working anymore since yesterday and have started using yahoo mail app and it's good! But I still need it for my work email though! It happened the day after I got the upgrade fix.