I deliberately make them compatible.
I don't think MA has any matglosses or reactions. Only magical weapons, which merges perfectly with the new infusion metals. I got a masterwork "Vicious Dragonsteel warhammer of bashing" from a chest.... not that I can use it though, +2500 degrees is something of a problem. Yet if I could - (that's a big if, it incinerates your hand after two turns, I'd need a froststeel gauntlet or something) it'd be a STUPENDOUS weapon.
Oh, and, uh, changes... well, I fully enabled the magical weapons, though not for crafting, instead the new 3 kinds of chests can have them inside. Spiders are going to be no more than a nuisance, they are set to ambush mode so they won't find you unless you find them. Yet if they do - one Giant red-back spider nearly dispatched me and four dark outcast drunks, and that says something. There are probably some minor tweaks here and there, but nothing of notable magnitude.
One word of warning - watch out of dark outcast caves. They won't web you (part of my attempts to stop crashes), but usually there's a mighty gajillion of them loitering right outside the cave entrance.
Also, the boxes, chests, and crates are abundant in chasms, but you're unlikely to get to them unless they are outside, or you play fort mode. Caves have a few of them too. "Boxes" are small, their icon is that of a block, and they usually have jewellery inside. "Chests" are a bit larger, their icon is that of an armor stand (the musical note thing), and they have weapons and small armor pieces inside. "Crates" are large, their icon is that of a bed, and they have suits of armor and shields inside. Each container type is present in wooden, metal, and stone forms. They don't attack, usually. Or rather they'll try to push you. They'll also try to move, despite the IMMOBILE_LAND tag, but oh well. I guess they're posessed artifact boxes.
If you meet something you don't recognize, post here, it might be a feature I forgot.
Edit: oh, one more thing.
If you still have crashes, try removing the entity_megabeast file and genning a new world. If the game reacts to "too many entities", removing that might solve those crashes.
[ May 08, 2008: Message edited by: Sean Mirrsen ]