Hello,
Never Mind GOt the issue fixed.
Thanks
THough
Separate Installs for WordPress and Plugins.
But as mentioned above. It was completely fine a week ago (and has been working for months).
The issue occurred today when I went to add a post.
Its definitely not the plugin. It is wordpress that is causing the issue. If it is working on all the sites and not one. Then its the wordpress program because all my plugins (about 4) are not appearing under the settings tab. But do appear in the Plugins tab.