Thanks for reply!
Even last update didn't help with scrolling problem and loading cornerstone preview. I am not using any cache plugin, on server I disabled nginx cache, disabled gzip, even set up FPM over Apache instead nginx (cornerstone didn't load at all in this case).
So I made restore all updated sites to old stabile version. Everything works ok again but I'm worried about future updates..
Thanks again, your support is great, but can't say the same about your developers.