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Language model switching is performed by OpenEars.framework rather than by RapidEars.framework or RapidEarsDemo.framework, so it is kind of unlikely that the issue is related to switching from the RapidEars demo to the licensed version despite it appearing at that time (I won’t say it’s impossible, but I am not personally aware of a way that it could occur due to the fact that RapidEars doesn’t perform that function).
RapidEars only adds changes to speech processing, and callbacks, so those would be the only things I could offer advice with specifically regarding your new RapidEars framework, but it sounds like you are confident that you are receiving all RapidEars and OpenEars callbacks, is that correct?
This is a bit of a tricky one because there also isn’t any difference in speech code between the demo and the licensed version; there is just the timeout after a few minutes in one and the license checking in the other as differences. It would be unusual to get any kind of a behavioral change in the actual engine as a result of changing over to the licensed version since there isn’t different engine code.
If you are definitely receiving all expected callbacks from OpenEars and from RapidEars, I would recommend beginning by taking standard troubleshooting steps to see what the issue might be. Step one would be to turn on OpenEarsLogging and verbosePocketsphinx and verboseRapidEars, and see if there is anything in the logging to let you know what is happening when you switch models. Please feel free to show me the logs (it’s fine to do a search/replace for private info in there as long as you show me all of the OpenEars logging from the beginning to the end of the app session without removing any of the OpenEars logging in between).