Hi, The following sequence causes segv with 4.00/03: root [0] TMatrixF m(2,2) root [1] TBuffer b(TBuffer::kWrite) root [2] m.Streamer(b) root [3] b.SetReadMode() root [4] b.SetBufferOffset(0) root [5] TMatrixF n(2,2) // If default ctor is used it works fine. root [6] n.Streamer(b) *** Break *** segmentation violation I traced it down to a leftover from the TMatrixF/D::Clear() method, which is also called from the Streamer(). By adding 'fElements = 0;' to Clear(), everything is fine. A patch with the above fix is attached. I'm not exactly sure in what ways the Clear() method is used ... perhaps a more elaborate fix is needed. Cheers, Matevz
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