Behaviour tree stopped working

Everything was working fine after migration from 4.12 to 4.13, BUT after i made some changes in Behaviour it stopped working, I went back to as it was before and there is no reaction from BT.
Looks to me like decorators don’t run. I had a branch that was running well, re-connected it , and it doesn’t anymore.
Is there some changes in BT system in 4.13? could find anyhing myself.

Also when I click on blackboards, sometimes it throws me out of UE