I'm actually on the latest pro build of iToo forest and 3dsmax2013 at my office (my IT guy is out this week) and am having such a frustrating problem. Often the file I'm working on will all of a sudden lose all of the forest data when I open it again on another computer or even the same one. All of the forests just say "mesh" and the usual roll outs are gone.
It's a pretty dense file geometrically speaking but there are only 4 or 5 forests.
Any ideas? Many thanks in advanced.