I see that this issue has been raised before with other routers, but I will post it again because it has not been resolved. Just FYI.
When upgrading to V24-SP2 build 17798 for the WZR-HP-G300NH (Version 1), I cannot get any Apple iPod or iPhone to connect through wifi. It will actually look like it is connected, but you cannot get any internet access on the device. I tried messing with all the Advanced wireless settings, etc, but it was still no go.
I downgraded back to build 14998 and everything works again. I suppose this could be an Apple issue, but there are way many more Apple devices out there than there are Buffalo routers, and the iPod's and iPhone's work fine on other routers.
Thanks,
Wade