hi,
just installed the 4.4.49 update version today and rendered the scene with the three glassplates with it.
These are the results: SR = Standard Renderer / PT = Path Tracer
That looks a lot more like what I / we expected with this setup, I guess
CHeers, Klaus
ps: while rendering with the path tracer about 90 minutes of the the total time needed - that is about half of the rendertime - Terragen could only use a few cores on my machine because there were only two or three buckets left to work on.