Yes, I originally had sockets 12-16 in there, but then I noticed his center of gravity goes way out of whack whenever he "turns". Even though the animations are blending, the whole mesh shifts to the side so it looks like he's walking on the side of an invisible wall. I also noticed that UT2003 characters all have sockets…
Your model doesn't have sockets 12-16, which are used for animation blending. Go into yout animation file and add the sockets manually. This page explains what I mean, go down to the "Sockets Explained" part: http://www.sunny-d.com/ut2003tut_page7.html I was able to get your animations to blend by adding the sockets. So…