We can all see the future, read minds and let your problems disappear even if you don't tell us what's not working exactly...
Oh wait....the problem thing is not true
So please add what is not working, what you expected and perhaps code + screenshot.
octree maps do not support VBOs at the moment. You can try to use the latest SVN/trunk code, which has some changes/fixes for this, but it's still WIP.