What worked for me was to go to the hidden page mentioned above to change whether a proxy should be used for IGMP, and leave that setting alone. However on the left hand side menu you will see link to Host multicast filtering. Click on that link and enable for all hosts you see, checking all the hosts. Leave max channels at zero. This may be overkill, because you probably have to enable only for the hosts you will use, such as android tablets and phones, and laptops. For me, the direct link to the page needed is: