Cannot Update Existing Pages

Hi,

For the past few days I have been unable to update existing pages on my site. Creating and editing posts is fine, but the pages are causing trouble… this just started happening, and to my knowledge nothing has been installed or changed to initiate the problem.

Here’s the site

plug-ins include: all in one SEO, author image, contact form 7, contextual related posts, dagon design sitemap generator, db cache reloaded, google xml sitemaps, wordpress.com popular posts, wordpress.com stats, wp hoto album and wp super cache

Any help is appreciated, thanks!