It seems that TMatrixD and some other matrix classes are dissapeared (substituted?) starting from some version of root5. Doed it correct?
In any case is is not a minor modification and should be stressed in the development notes possibly with the recommendations how to migrate to the substitutio classes.
Well, I found it in root.cern.ch/root/Version50800.news.html.
Hmm - will it be back compatible also for IO? If I saved TMatrixD in the tree by the old version would it be readable by new one?