@Simon79 if the problem persists after that, can you try clearing Kodi's data and just installing ONE video add-on (selected from one you normally use after installing Wookie) manually, via a repository or even just a ZIP file.
Whilst Nigelar and I seem to agree on most things in the forum, there is a small chance that the Wookie Wizard, or rather one of the specific packs, applies a tweak to a setting or XML file that doesn't cause most people problems, but somehow is playing up for you Simon. If this is the case, then installing JUST a video add-on should allow audio to start immediately. We then know to either try a different pack from Wookie or a different Wizard. Or comparing settings and XML file contents before and after Wookie.