Unreal Engine 4.7 Preview

Hi,
I don’t know if is reported before, but I encountered a strange bug in latest preview 7.
When I attach(parent) an actor to a target point and try to move it will fly away in a strange way. transform values will get really high values and if I don’t let go right away, editor will crash.
I encountered in two different projects. Both of them where upgaded from 4.6.