@muthunder627 Sometimes if you have accidentally clicked on a post's prefix it will default to a view that only shows that prefix. Like Twitter, a post's prefix acts like a hashtag. If you click the prefix it will filter all the posts that begin with that same prefix- "video", "MU Press Release", "HerdNation.com", etc. There is a glitch in the new system that sometimes changes that to your default view.
Is there a red "no" sign just under your "post new thread" button? If there is, click it and it should return you to the normal settings. Let me know if that helps.