After login or teleport, it often happens that some objects (usually large props like parts of buildings, landscaping stuff) are not displayed until I (accidently) rightclick on them. In older viewer-versions you could toggle wireframe off/on to force all objects to be shown and there are other tricks to 'unhide' those objects. That issue is well known for many years, for example, look here: https://community.secondlife.com/forums/topic/459592-problem-larger-mesh-props-remain-invisible/ and its a mystery to me why it gets no attention from the devs. Its extremely annoying, almost a showstopper for me. It just happens a lot to me, no matter what viewer I'm using (FS and LL), what PC I'm using and how fast my connection is. I'm not using any exotic hardware or settings. After almost every teleport I'm standing on invisible floors, bouncing against invisible walls and looking at party rezzed buildings.