Hi all,
Same problem here, with build 1.9.99.1 (free non-commercial version) of TG2, running on a Windows 2000 system Bi-Pentium III station. Crash crash crash and crash again. Sometimes on launch, or when I move camera, add a node, delete a node, open a node, edit a node, etc. Just can't use it. :/
By the way, build 1.9.99.1 installation (in a new folder) destroy older version of TG2 (tech preview 2 free non-commercial edition).
nb: Please excuse my bad english.