Router ER7206-v1.0, Firmware v1.4 - following application, YouTube will only work in Restricted Mode
Following application of the firmware to the router, YouTube used by any browser (as tested on Safari, Chrome) will only work in Restricted Mode and this cannot be turned off.
The YouTube setting for turning Restricted Mode on/off say that it has been set by the Network Admin and the on/off toggle for Restricted Mode within the YouTube profile setting is greyed out and cannot be changed.
This restricts results that YouTube searches return and also removes any comments against any video so you cannot give or read feedback.
Downgrading back to V1.3 of the firmware resolves the issue (which is what I have done for now).
Andy