We can't help you there - you need to talk to the admins.
Best place to ask is here:
Bugs and Suggestions[
^] - they read everything there, and you can use WINKEY+SHIFT+S to copy an image of the screen showing the problem, then paste it into a message there (it won't work anywhere else). That can help isolate the problem.
But first, just check that you haven't accidentally applied a filter: if you are talking about the main page, there is a "Filter articles, news and messages" line with buttons below - select "All" and see if that improves things.