This has been on a few times now.. I think it is - Clear your cookies and everything else you can... Then go on the Livery again and save it.. It clears the issue from what I can remember.. but like I said.. It's been on a few times.
If you want to clear the cache and data, you can press CTRL+SHIFT+DEL to pick what to delete in most browsers. You will want to clear the cache, not cookies. Clearing cookies will log you out of websites.