I've recently come up with my first TG 2 picture (there is a link in the Image sharing section) but I had some issues with adding populations.
Actually, I've been using the free version of the tech preview, which limits the number of populations to 3 for rendering. However, the trouble was that if I saved any .tgd file containing more than 1 population (though, less than 3), it wasn't possible for me to re-open that file later on (i.e. TG 2 seems to crah when opening the file).
Is it a TG2 bug which requires correction, or does it belong to the limitations of the free version ? (the error message mentions an invalid token...)