The following simple widget BP was working fine before last few days 4.4.0 to 4.4.0 update (yes, no version number change on my end):
I could isolate that the “delay” node would stop the chain doing nothing after it, but if I were to bypass it, “Find All Actors from Class” would crash the editor every time. I should mention that it used to work fine without the delay earlier too.
On my end, I had 4.4.0 installed (beta, then updated to release) and on the weekend it did another update but the number remained 4.4.0. On your launcher it says 4.4.1? When was it updated?