Hi Hans,
I normally only ever use Q1 to check for composition then use advanced or Uber, so it is very rare I try Q2,3 and 4.
Q2 does the same on my machine, it constantly thinks and thinks and thinks. I had a guess that the tree branches might be too difficult for the simple Q2 ground shadow routines. I'm probably totally wrong!
Deleting all the trees then allows Q2 to render the remaining scene straight away.db4tech
