For one site I cannot proceed past the post installation for Back Up and Admin Tools.
For the other only Admin Tools is affected.
I have logged out, cleared cookies and tried other browsers and ISPs but on clicking the Apply/Accept button nothing happens.
Both sites have Siteground's PageSpeed and Memcache on.
However, this problem has only arisen on upgrading to the latest version
I have other Joomla sites on the same server and the problem is not occurring.