After upgrade (both DSUCP and XWAUP) sometimes some crashes happened on missions imported both from x-wing and tie-fighter games and the original XWA campaign. Those same missions are functioning smoothly on non upgraded installations. I noticed that the main difference (graphics a part) is that with original non upgraded XWA I launched the game with a shortcut which set CPU affinity at a single processor (an old way to prevent problems with audio in game). I made the same with the Upgrades, and the crashes problem went away.
I hope that this would be of some help
cheers.
PS
also, i noticed that executing the game on a single CPU improves performance incredibly: animation, gameplay, everything goes more smoothly and without glitch of sort.
