Yahoo Email App stopped notifying me of new messages.

Hey guys. I've been noticing an issue with the yahoo mail app on my phone and I have no idea how to fix it. I used to get notifications whenever I had new messages just fine and now I'm not getting them at all. I have to open the app itself to check for new emails. How annoying is that? I don't know if it's a yahoo issue but any help would be very much appreciated. I haven't touched any of my settings in ages so there is no reason for them to not be working. I have notifications turned on and set to alert style and yet not a thing appears, not even in the drop down notification center. I don't know what is going on. Please help!

Phone is an iphone4 still using ios6.1.3 (still refusing to update to os7 as long as I can since I have an older phone)

Please let me know if more information is needed.