UE4 crash when i try to delete an object that is intersecting the terrain

ok, i don’t know but maybe it has sth to do with memory usage.
I updated to the new UE4.
finally i have to invest in a 8GB mainboard i guess.
But somehow it is odd. This problem didnt occure before.
MAybe because i have now more objects in memory. lol
CouldnT there be a message that would tell me that i have run out of memory?