Haven't tested all you mentionBev but c&p'd your post and will test layer...am having lots of crash problems with instancing which after 3 or 4 crashes always drives me screaming back to stable  Terragen 2 which I've yet to crash....sigh...I do so want Bryce to work.. ....

 

Once in a while I look around,
I see a sound
and try to write it down
Sometimes they come out very soft
Tinkling light sound
The Sun comes up again