after researching this issue I removed all widgets and all modules and tried to create a new post, however it still didn't submit. The only posts that are showing are the ones I made about 2 weeks ago.
Then I thought it was a server side issue. So I have checked my disk space which is good, it appears mySQL is working ok as I deleted 18 discarded posts from it via the Pligg Admin panel. And my webhost has worked fine with Pligg so far so I imagine that it is compatible.
Does anyone have any ideas of how I can resolve this issue please? The site is: www.yuity.com. Cheers!