Thanks AJ
I always put my needed files (obj, tgo, tgc, tgd, pop-cache and others) into one local project folder. The files for one object like obj/mtl/textures are always in seperate subfolders to keep the overview - especially when I pause a project for longer time.
At the moment I think it happens only with obj files of the xfrog
oceanic collection (you can se because of the "...
OC..." in the file names. But all textures are there and are rendering fine. In the older TG3 versions the same plants never caused this kind of warning.
Usually I would never mind because my renders are obviously ok, but if I would send the files to pixelplow for rendering, the renderjob could fail. So it would be interesting to find a solution before I start animation rendering there again.
I think I will copy this to the Terragen support section...