Well, can't remember each one, but one example is the House/Interior tutorial series created by Dan Silverman. Steps in that series won't compile for the above-mentioned reasons.

As for version, I have 6.40.5 Extra (though I could have sworn I've upgraded to Commercial Edition at some point.. hmmm... need to find that info)..

I think it might have to do with the paths setup; how 3DGS manages assets. Perhaps the paths aren't matching up to what the Authors' used in their creation?