We are also experiencing issues on Unity 5.5.0f3.
According to my Wwise Settings in Edit > Wwise Settings, we're using Wwise v2016.1.5 build 5910.
According to the Wwise launcher, we're using Wwise v2016.1.1 Build 5823.
I'm not sure if I know how to get the Wwise Integration version number, if that's different.
We're getting the same error spam, and a lot of weird audio positioning issues.
Errors like:
Wwise: Unknown game object ID. Make sure the game object is registered before using it and do not use it once it was unregistered.(Object: vfx_waterfall_large (3) (UnityEngine.GameObject))
UnityEngine.Debug:LogError(Object)
AkInitializer:CopyMonitoringInConsole(ErrorCode, ErrorLevel, UInt32, IntPtr, String) (at Assets/Wwise/Deployment/Components/AkInitializer.cs:279)
AkCallbackManager:PostCallbacks() (at Assets/Wwise/Deployment/API/Handwritten/AkCallbackManager.cs:429)
AkInitializer:LateUpdate() (at Assets/Wwise/Deployment/Components/AkInitializer.cs:248)
And problems like AkEvents triggered near the active AkListener sounding far off to the left and muffled.
Given the different versions we're using of Wwise, might it be possible it's something new introduced in Unity 5.5.0f3?