Facing the same problem with two sites I’m hosting there.
Can’t connect to them, neither live nor thru the WIX editor.

BUT… something has changed between AVAST pattern update 170517-14 and 170517-24.
At least I can access the live pages again, still I can’t edit them. When trying to start the WIX page editor, still get the script-in error and connection gets reset.

Funny thing is, on the WIX site this issue has been closed with the recommendation to get in contact with the respective A/V vendor and work things out with them…