Sorry… it’s a test website not accessible directly from the net.
I did some test: I removed all customizations from it: the style.css has only the snippet you just posted here and the is no functions.php.
I’m also using a child theme with child themify.
It didn’t worked, the issue is still present. It was working fine prior to todays version, I think it was 3.3.23.
Can I do something else to help you out?