I had a similar problem with After effects cc 2015 and Premiere pro cc 2015: I wanted to import an after effects project into a premiere project directly, and I couldn’t hear the sound.
The solution in my case was to clear the cache (not sure whether or not you have to do it in both software, but here is what I did anyway):
(on mac)
in after effects:
After Effects CC > Preferences > Media & Disk Cache > Empty Disk Cache
After Effects CC > Preferences > Media & Disk Cache > Clean Database & Cache
in premiere pro:
Premiere Pro CC > Preferences > Media > (Media Cache Database) Clean
Hope this helps someone 😉