The latest Sketch Beta's changed a lot and cause some importing issues. We're working with the Sketch team on fixes.
The best thing about both Sketch and Framer is you guys work with each other :D So fixes are always on the way ;)
Thank you- was having some major issues. Looking forward to an update
For now just use stable Sketch. I'd recommend that anyway these days as they're faster to ship beta's and they're a bit more unstable then before.
But resizing symbols with constraints is so tempting 😃 changes my entire workflow