Hi, I've noticed a couple of problems with THStack. 1) If you try to add a histogram after having drawn the THStack, then try and draw it, you get a seg fault. The problem is that BuildStack just returns fStack if it is already non-zero. It should probably check that fStack->GetEntriesFast() == fHists->GetEntriesFast() 2) The copy contructor is just the default . This means that fStack gets copied too. If the above was fixed then the following code would show identical output: THStack s1 ("1", "1"); s1.Add(h1); s1.Add(h2); THStack s2(s1); s2.Add(h3); s1.Draw("h"); new TCanvas("c2", "c2"); s2.Draw("h"); Matt
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