In attached picture (group-v7) you can see yet another problem with groups in vray7. The group members (meshes this time, no proxies) are rendered in wrong (random) order. instead of pyramid+torus+teapot combo I get 3 teapots (and it changes randomly in the next render). Vray 6 doesn't have this problem.
Is it also Vrays 7 inner problem?
Please sort it out ASAP 'cause groups as geo is essential thing for us
P.S. Less important: With any vray version, when forest is displayed in proxy mode, all group members are being placed in one point, which is wrong (see group22.png). The cloud mode shows it right way though.