Terragen 2.1 is out. Extra features and speedups. Here's an appropriate seasonal image I rendered this morning with the new version (and using Linux and Wine) - as opposed to what one might want to do with Mistletoe and the other substance!
This image took about an hour, I did a similar one with fewer layers yesterday and than took 3 hours!? Maybe it was the restart or the changes I'd done up to then?