I have the same problem here in Venezuela since two weeks ago on a Blackberry Curve 9300, Maps are not loading and can't navigate as well.
I'm so sorry about it because I use Waze on a daily basis and It is not working anymore (See https://www.waze.com/forum/viewtopic.php?f=3&t=55518
), as I understand Waze is no longer providing support for the app on BB so I feel so much for all the time wasted in map editing and comunity work.
I dont blame waze for this because I'm able to understand that BB does not evolve his operating system and I'ts hard to keep support on an old version, but I hope waze undestand that they will be loosing a lot of users who usually work for them improving maps and sending information of routes and traffic, at least until they upgrade his celphones.
Thanks a lot I't was useful!