Every app must be specifically ported to every BB model and major OS level combination. That's quite a number of combinations, and many developers choose to not do so...rather, they choose to support a subset. From what I can see on the AppWorld catalog page, the waze developers have not ported to the 9900...and only they can answer if they indeed ever intend to.
Occam's Razor nearly always applies when troubleshooting technology issues!
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