Been a while since I used the ivy generator. I'll check to see if there is a new build because this is an old one, but I'm not sure if the png for the leaves is bad; or carrara just can't read them, or if it's because the leaves are not UVmapped. Ether way I can't get a texture map or an alpha map to work.

I'll do some more checking/testing but I know this used to work quite well.