It has been disabled because this view was never meant to be the readable view of the manual and too many people are pushing their readership here. This view used to display the very ugly and disfunctional *unstable* version of a manual. So, it has been turned off since we do not want software users to be misled by half finished manuals.
To access the UNSTABLE read-only version of a manual please either use the 'view' link on the edit interface (shown below) or read the STABLE (published) manual (eg. at http://www.flossmanuals.net).