Well, if it is a version problem, I suspect it's due to DirectRT on the first machine (v2004.1.12). That is a REALLY early version of v2004. The final release of Direct v2004 was v2004.3.27 which you can download here:

http://www.empirisoft.com/download_old.aspx

The first machine has the final release of MediaLab v2004 installed on it, so I expect you should be ok there.