Yahoo mail is a complete shambles. I can't access my BT Mail emails from within Chrome as it allows me to see the list but thats it...I can't read them, delete my spam or anything usefull at all. I have stopped accessing through Windows Explorer, as my PC keeps freezing. So I recently changed to Firefox and its much better, although that gives me the odd blip as well.
I am driven to the conclusion that it all down to Yahoo itself. I would change me email address if I hadn't had it for 20 years now, and I don't want the faff of changing. This problem with Yahoo has been going on for nearly 2 years now and I am totally fed up.