I have seen this for a while but only for a few animesh objects and do not know if it is just me or a potential bug. Some of them seem to be slightly rotated, relative to the ground/horizon. It looks like maybe 45 degrees or so. I don't have any older viewers to test, but folks using Firestorm or the official viewer tell me the items are oriented properly for them. I have included a couple of images to demonstrate. My info is: