if you whant to sub mitt a bug, http://projects.blender.org/tracker/?group_id=9&atid=125 BugTracker, elysiun genral is more here to help you uses blender. if you up to submitting the .blender, i could download it i see if im having the sam problem here
Sorry for the delayed responce but had networ problems over the weekend. It seems to work fine on my system.
I duplicated the tree 12 times and suffered a fare a mount of lag but was able to navigat with the midle mouse button and it did not crash. though the model is very detailed and did lag on my system.
Win XP Pro
intel 3Ghz
512Gb Ram
on bord graphics adaptor, 32meg and the set to 128 reduce lag