When I try to clear cache and save I get "Requested page not found. ". I have done a few upgrades recently, including YJSG 2.2.3. I did the development work on an offline copy of the site on a subdomain (dev.abbotsholmians.co.uk). Clear cache and save works fine on that copy of the site.
Are you sure your are posting in product assigned forum?
What is your CMS version?
: Joomla 3.x
Link to installation
Have you edited any files? If yes tell us which ones.
Is this personal or client website?