In order for vlans to work correctly with the Buffalo WZR-HP-AG300H access point, you must upgrade the firmware to (at least) build 19154 of DD-WRT. I think it's some kind of bug that causes ARP replies to be filtered.
I copied the config of one AP to another to find that it didn't work on that device. When comparing the config of both devices, I noticed that the APs were running different versions of the firmware. I do vaguely recall that I updated the firmware of one AP. When the firmware was applied to the other AP as well, all problems were gone right away.
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