Sorry - now it's a new problem. When i hit render ( mentalRay ) i got following massage:
PHEN 0.4 14 MB error: Forest and Shader versions don't match (FP = 4, FSHADER = 4)
PHEN 0.4 14 MB error: Forest and Shader versions don't match (FP = 4, FSHADER = 4)
And the forest objects are not rendered. This happens to existing f-objects also to new created f-objects using the modified *.dlo
But i'll switch between these two DLO's for working or rendering - that's not that bad ;-)