Is there a certain build that you'd recommend for this? The tutorial used a 2010 version, but I'm not sure if that'd be going too far back... but I guess it wouldn't hurt to start experimenting. Thanks again for your help!
No, it does not matter. Actually it has to work with each engine build, no matter if it's UT3, the first UDK build or the latest one. There might be something wrong with your UDK installation or your system itself. There have been several reported for the may 2012 beta so I suggest you use the Feb/March 2012 build.