I can clearly see New Topic just above your post at the top of the page, browser issue maybe?
To find all of your posts, click on Profile on any of your posts, and select View all Posts by this Member.
What DAZ 3D itmes do not show up in the viewport, but do appear in the Scene tab? I know there was a problem with some OBJs a long time ago, but that never happens now. What version of DS are you using?
One item that it can happen with is the Dream Home rooms, which load in to the correct position to form the house complete. They are there, but just not where you think they should be.