Hey, I've just started playing around with Framer Studio and it looks really promising, but i'm having the same issue as a few others on 10.8.5.
Here's what shows up in dev tools
A fix for this is coming soon. For now, you can update to 10.9 and the problem should be resolved.
I had the same issues, but updating to 10.9 totally solved it.
Might be webkit related? Not sure if upgrading safari will fix it, but am pretty sure that 10.9 comes with a newer webkit/safari :)