Login to your router. Then, click here:
http://192.168.1.1/index.cgi?active_page=6059&req_mode=0&mimic_button_field=goto%3a+6059..&strip_page_top=0&button_value=6059
Then, set "IGMP Proxy" to disabled.
Yes, this is a hidden page on the latest firmware.
Enjoy!