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Thanks for asking.
Please make sure that you've entered the bundle identifier of the application your Behaviour controls at Behaviour Construction Kit > Behaviour Factory > [Your Behaviour] > Bundle Identifier.
Remote Buddy will then automatically switch to your Behaviour when the respective application is front-most. If you want Remote Buddy to also switch to your Behaviour when the application it controls is currently running, but not the active application and no other directly supported application is currently the active application, either, you'll need to activate the option "Handle application in background with priority:" and set the priority to -1024.
Best regards,
Felix Schwarz