Hello! I bought a theme Mercury from here and suddenly the content builder is no longer saving my changes. 
My url is katerinamarie.com
It was working perfectly for years and nothing had changed/updated on wordpress so I’m not sure why. This has happened once before a few years ago, and I solved it by rolling my site to a backup. I tried that again but it didn’t fix it this time.
Hi @Sparklii,
Please contact the author of your purchased theme, the theme author will assist you.
How to contact an author to get support or for any technical query:
Thanks