I've just started the "Mastering Unreal Technology" book tutorials, and find, no matter what method I try, some textures, static meshes etc that are on the accompanying CD cause UnrealEd to throw up the usual no label error, stating that I am using commercial files which is not allowed. The program then crashes. I have a feeling this could be a program glitch. I built my own computer which is fast well kept and the graphics card is ATI 9800XT. Other than this frustration the book and tutorials are excellent.