Oh, it's worse than that. WoW doesn't even properly recognize anything beyond the primary adapter on your main card. WoW takes its display information indirectly from one of the places Windows logs it, and is largely blind to anything beyond the first display ID. This can also cause things like having an incorrect resolution list displayed for displays on secondary adapters/cards, including totally omiting widescreen options. Yay, Blizzard.

Yeah, I told them about it. Repeatedly and until I got ahold of someone who sounded reasonably technically competent. This was about 6 months after release, and it still has the problem. GG Blizz, aye?

Maybe I'll just go back to one of the single-display maximizer layouts for now...