I used to receive all Yahoo email notifications on my phone basically as soon as I got the email. I am using the yahoo email app on my Droid Incredible.
However, the past few days.... I have not received any notifications. The email icon does not show up at the top of the screen. No notification sound. No vibration. Nothing.... The only way I can see if I have new emails is to go into my inbox and it checks for new messages then.
I have restarted my phone. I have uninstalled / reinstalled the yahoo app.