Hmm odd problem, do you have WP_DEBUG defined and set to true? If not would you be able to?
There could be some errors hidden on the post listing page that are currently being hidden.
You might also want to check if there's any caching happening. You could manually clear your transients and clear the cache of any caching plugins you have installed.
Other than that you might want to open up your browser's debugging console to check if there's any JavaScript errors occurring on that page.