I started to face this weird problem after the last update. So the first time everything worked fine, but after that the problem started. Files transfer properly but when I activate the link it says activated and unreal live link says that it receiving but neither characters nor cameras move. 
I also get this warning "Upgrade your code. Curve elements count has changed from the previous frame. That will clear the previous frames of that subject."

Everything is up to date. I re-installed everything. Don't know what to do?