OK I have tried all the skins and don’t like any of them but how do I return to the default skin? It seems it’s not include in the list of skins.
It should be present under the name of default.
It’s not in the skins list
If possible, try reinstalling vital, it should fix the issue. Make sure to back up your presets and skins before installing.
When you load a skin, you can reset back to the original skin via the hamburger menu 
click the option at the very bottom
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as far as i can see there is no suchh option in the mac audiounit (1.0.7) version…
(but there is a “Default” skin loadable in the advanced section)