Back compatability problems

Hello all, I seem to be having problems with back compatability between version 4.1 of Lectora and Lectora 2005. I've exported the XML from 2005 (as per usual) and tried to import it into version 4.1 but it keeps throwing a parsing error, and then not loading. Are there some features that are in 2005 that i shouldn't be using in 4.1? If so what are they? I read that older versions just strip features it dosen't understand but how well was this implemented? Any suggestions will be exchanged for happy thoughts.Yours with fingers Crossed,Mipf.

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