^^ I'm in the same boat.
If i start with an empty level and try to create a terrain it always crashes when i try to assign mat. resource.
If i use the basic level and edit it - it seems to crash randomly.
Both times = 'Glasses has stopped working'.
I have dlc checked / checked path was right / verified files.
Editing the basic level seems to work as long as you save every 5 mins.
Hopefully a fix soon...