Hi Chad,
Mint was created by Motorola wireless division, or better, by Symbol. Then the wireless solution was acquired by Zebra and at the end by Extreme Networks.
The option of configuring the interface connected to the AP as multicast router interface could be a possibility.
At the same time I need, as you wrote, to enable IGMP snooping on the AP... otherwise the unwanted multicast would kill all the wireless communication.
Let's hope it will be fixed ASAP.
Thanks for your time !
ema