Logging into the Magento Connect Manager, I've added the Extension Key from Magento Connect, and clicked "Install". For 0.2-0.5 Seconds, the "Please Wait" box flashes up then promptly disappears.
Nothing else happens at all. It happens whichever extension I try to install.
The store is v. 126.96.36.199 installed on CentOS
Could any body shine any light upon this at all, or suggest where I might look for more information.