Traffic Global doesn't seem to be working for my anymore, P3Dv5.1
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If you did a full install you need to re-install TG, but you only need to update three folders Client , scenery ,content.
In fact you can get away with only updating the client but you should delete the shaders and the Config file before starting v5.1 this will put you back to default settings then tweak again for best performance.
IF you find an addon not working correctly disable it to check then look for the Dev update.