I had problems with Forest Pack Pro 541 and VRay 3.60.04. When a Forest Object ist selected and I hit render, MAX hangs sometimes after a render job is sent with backburner. As I came from Mental Ray and the same error existed there I think, that it was a problem of MAX, not of Forest Pack. Nethertheless the problem is gone after I switched to FP Beta 601b. My problem now is, that I have very long render times if a grass preset is in the scene. With some plant objects, for example form HQPlants all is normal. Render time is without these objects (test scene) 18min and with 3 HQPlants in it 20min. But when I render a grass preset from the new installed FP libraries (a render region half filled with grass) the render time rises from 7min to 28min. Is there any switch which I forget to push? When I render grass with my previous version of FP (541) and the same VRay i didn´t have this problems. What can I do for quicker rendering. I hope there is a easy adjustment like the "use placeholder ojects" in Mental Ray.