Double Posts

Within the last week my blog is showing not only double posts, but new blog entries are not uploading on time. I suspect a plugin is interfering with the latest version of WordPress, although I did not change anything since upgrading to WP version 3.3.

Any ideas what plugins might be causing the problem? I deactivated nearly all and I am still experiencing these problems. I have not changed Themes to see if this might be the problem.

Physlab