Houska, thanks for the quick reply.
I went back to the previous build and it also crashed.... then I remembered I have also installed "instance vault" the same time as the new beta.
I have removed the plugin and it seems to be rendering fine again.
I didn't expect an instance plugin to cause render problems but without it is seems to render fine.
EDIT:SORRY...after a reboot it crashes again. I am uploading the scene so you can have a look, I don't think it is caused by the plugin