Here are the settings I use with Habaware, I've never had any problem exporting UVs. Be aware that there is a bug in Habaware that prevents scaling multi-group exports at other than 1:1 (use Maz's Objaction Scaler Instead). Didn't know Max 7 could do OBJ native, maybe I'll finally have to buy it (only $2,700!), I'm still on 3.1.