I have this problem lately. I opened some older scene and ForestPack object was replaced with empty mesh. I thought it is caused by some incompatibility or something. But today I opened older scene which open fine, make some adjustements (not to ForestPack objects), saved it and now I opened and all FP objects are gone. What is this? I have latest FP plugin instaled on newest max with VRay 5. Is there any way how to get all FP objects back? Thank you.