Hello.
After struggling many days with skins to make it work i figure out what is happening.
My problem is that when i hide some elements the skin is broken and goes back to default.
I found that this is happening when you make any change to system>script>Don't require permissions!
json file recognizes this->` character as start and end of command description with the result being like this:
Normal behavior: 'Reset Configuration': 0,
Broken skin: 'Don't require permissions'

I have no idea how WebFig skins work. I've never used WebFig (I am not a masochist ).
But you may try escaping single quotes.

It's still exist. When you done any manipulations wit this filed - it crash the skin and after relog - skin return to default.