Can't create articles since update

I downloaded the theme this morning, and was playing around inside the admin system, i didn't touch any of the code other than changing the footer...

I was having problems with the PhotoSlide so I decided to download the quickstart version instead...

It didn't fix my photoslide problem, but I now I can't create articles either.

Everything else works fine, but when I create a new article, and click the 'Save' button, nothing happens. But it allows me to click 'Cancel'.

Does anyone know whats wrong?

Thanks,